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Daniel Prilik ed2554fb65 move docs to research
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<HTML>
<HEAD>
<META NAME="GENERATOR" CONTENT="Microsoft FrontPage 4.0">
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<TITLE>6502 Reference</TITLE>
<LINK REL="StyleSheet" HREF="../obelisk.css" TYPE="text/css" media="screen,print">
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<BODY>
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<H2>Instruction Reference</H2>
<P>Click on any of following links to go straight to the information
for that instruction.</P>
<P><TABLE BORDER="1" CELLPADDING="0" CELLSPACING="0" WIDTH="450">
<TR>
<TD WIDTH="7%" HEIGHT="25">
<P><CENTER><A HREF="#ADC">ADC</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#AND">AND</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#ASL">ASL</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#BCC">BCC</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#BCS">BCS</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#BEQ">BEQ</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#BIT">BIT</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#BMI">BMI</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#BNE">BNE</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#BPL">BPL</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#BRK">BRK</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#BVC">BVC</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#BVS">BVS</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#CLC">CLC</A></CENTER></TD>
</TR>
<TR>
<TD WIDTH="7%" HEIGHT="25">
<P><CENTER><A HREF="#CLD">CLD</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#CLI">CLI</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#CLV">CLV</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#CMP">CMP</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#CPX">CPX</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#CPY">CPY</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#DEC">DEC</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#DEX">DEX</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#DEY">DEY</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#EOR">EOR</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#INC">INC</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#INX">INX</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#INY">INY</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#JMP">JMP</A></CENTER></TD>
</TR>
<TR>
<TD WIDTH="7%" HEIGHT="25">
<P><CENTER><A HREF="#JSR">JSR</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#LDA">LDA</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#LDX">LDX</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#LDY">LDY</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#LSR">LSR</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#NOP">NOP</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#ORA">ORA</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#PHA">PHA</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#PHP">PHP</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#PLA">PLA</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#PLP">PLP</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#ROL">ROL</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#ROR">ROR</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#RTI">RTI</A></CENTER></TD>
</TR>
<TR>
<TD WIDTH="7%" HEIGHT="25">
<P><CENTER><A HREF="#RTS">RTS</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#SBC">SBC</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#SEC">SEC</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#SED">SED</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#SEI">SEI</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#STA">STA</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#STX">STX</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#STY">STY</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#TAX">TAX</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#TAY">TAY</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#TSX">TSX</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#TXA">TXA</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#TXS">TXS</A></CENTER></TD>
<TD WIDTH="7%">
<P><CENTER><A HREF="#TYA">TYA</A></CENTER></TD>
</TR>
</TABLE>
<H3><A NAME="ADC"></A>ADC - Add with Carry</H3>
<P>A,Z,C,N = A+M+C</P>
<P>This instruction adds the contents of a memory location to
the accumulator together with the carry bit. If overflow occurs
the carry bit is set, this enables multiple byte addition to be
performed.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Set if overflow in bit 7</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Set if sign bit is incorrect</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 set</TD>
</TR>
</TABLE>
<P><TABLE HEIGHT="228" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IMM">Immediate</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$69</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">2</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$65</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPX">Zero Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$75</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$6D</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="24"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$7D</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABY">Absolute,Y</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$79</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IDX">(Indirect,X)</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$61</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">6</TD>
</TR>
<TR>
<TD HEIGHT="26"><A HREF="addressing.html#IDY">(Indirect),Y</A></TD>
<TD WIDTH="15%" HEIGHT="26">
<P><CENTER>$71</CENTER></TD>
<TD WIDTH="15%" HEIGHT="26">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="26">5 (+1 if page crossed)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#SBC">SBC</A></P>
<H3><A NAME="AND"></A>AND - Logical AND</H3>
<P>A,Z,N = A&amp;M</P>
<P>A logical AND is performed, bit by bit, on the accumulator
contents using the contents of a byte of memory.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Set if bit 7 set</TD>
</TR>
</TABLE>
<P><TABLE HEIGHT="229" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#IMM">Immediate</A></TD>
<TD WIDTH="15%">
<P><CENTER>$29</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>2</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#ZPG">Zero
Page</A></TD>
<TD WIDTH="15%">
<P><CENTER>$25</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>3</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#ZPX">Zero
Page,X</A></TD>
<TD WIDTH="15%">
<P><CENTER>$35</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>4</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%">
<P><CENTER>$2D</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>3</CENTER></TD>
<TD>4</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%">
<P><CENTER>$3D</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>3</CENTER></TD>
<TD>4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#ABY">Absolute,Y</A></TD>
<TD WIDTH="15%">
<P><CENTER>$39</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>3</CENTER></TD>
<TD>4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#IDX">(Indirect,X)</A></TD>
<TD WIDTH="15%">
<P><CENTER>$21</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>6</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="26"><A HREF="addressing.html#IDY">(Indirect),Y</A></TD>
<TD WIDTH="15%">
<P><CENTER>$31</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>5 (+1 if page crossed)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#EOR">EOR</A>, <A HREF="#ORA">ORA</A></P>
<H3><A NAME="ASL"></A>ASL - Arithmetic Shift Left</H3>
<P>A,Z,C,N = M*2 or M,Z,C,N = M*2</P>
<P>This operation shifts all the bits of the accumulator or memory
contents one bit left. Bit 0 is set to 0 and bit 7 is placed in
the carry flag. The effect of this operation is to multiply the
memory contents by 2 (ignoring 2's complement considerations),
setting the carry if the result will not fit in 8 bits.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Set to contents of old bit 7</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Set if bit 7 of the result is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Accumulator</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$0A</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ZPG">Zero
Page</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$06</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">5</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ZPX">Zero
Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$16</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">6</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$0E</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">6</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$1E</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">7</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#LSR">LSR</A>, <A HREF="#ROL">ROL</A>, <A
HREF="#ROR">ROR</A></P>
<H3><A NAME="BCC"></A>BCC - Branch if Carry Clear</H3>
<P>If the carry flag is clear then add the relative displacement
to the program counter to cause a branch to a new location.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#REL">Relative</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$90</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">2 (+1 if branch succeeds<BR>
+2 if to a new page)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#BCS">BCS</A></P>
<H3><A NAME="BCS"></A>BCS - Branch if Carry Set</H3>
<P>If the carry flag is set then add the relative displacement
to the program counter to cause a branch to a new location.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#REL">Relative</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$B0</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">2 (+1 if branch succeeds<BR>
+2 if to a new page)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#BCC">BCC</A></P>
<H3><A NAME="BEQ"></A>BEQ - Branch if Equal</H3>
<P>If the zero flag is set then add the relative displacement
to the program counter to cause a branch to a new location.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#REL">Relative</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$F0</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">2 (+1 if branch succeeds<BR>
+2 if to a new page)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#BNE">BNE</A></P>
<H3><A NAME="BIT"></A>BIT - Bit Test</H3>
<P>A &amp; M, N = M7, V = M6</P>
<P>This instructions is used to test if one or more bits are set
in a target memory location. The mask pattern in A is ANDed with
the value in memory to set or clear the zero flag, but the result
is not kept. Bits 7 and 6 of the value from memory are copied
into the N and V flags.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Set if the result if the AND is zero</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Set to bit 6 of the memory value</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Set to bit 7 of the memory value</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ZPG">Zero
Page</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$24</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">3</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$2C</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">4</TD>
</TR>
</TABLE>
<H3><A NAME="BMI"></A>BMI - Branch if Minus</H3>
<P>If the negative flag is set then add the relative displacement
to the program counter to cause a branch to a new location.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#REL">Relative</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$30</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">2 (+1 if branch succeeds<BR>
+2 if to a new page)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#BPL">BPL</A></P>
<H3><A NAME="BNE"></A>BNE - Branch if Not Equal</H3>
<P>If the zero flag is clear then add the relative displacement
to the program counter to cause a branch to a new location.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#REL">Relative</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$D0</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">2 (+1 if branch succeeds<BR>
+2 if to a new page)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#BEQ">BEQ</A></P>
<H3><A NAME="BPL"></A>BPL - Branch if Positive</H3>
<P>If the negative flag is clear then add the relative displacement
to the program counter to cause a branch to a new location.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#REL">Relative</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$10</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">2 (+1 if branch succeeds<BR>
+2 if to a new page)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#BMI">BMI</A></P>
<H3><A NAME="BRK"></A>BRK - Force Interrupt</H3>
<P>The BRK instruction forces the generation of an interrupt request.
The program counter and processor status are pushed on the stack
then the IRQ interrupt vector at $FFFE/F is loaded into the PC
and the break flag in the status set to one.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Set to 1</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$00</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">7</TD>
</TR>
</TABLE>
<P>The interpretation of a BRK depends on the operating system.
On the BBC Microcomputer it is used by language ROMs to signal
run time errors but it could be used for other purposes (e.g.
calling operating system functions, etc.).</P>
<H3><A NAME="BVC"></A>BVC - Branch if Overflow Clear</H3>
<P>If the overflow flag is clear then add the relative displacement
to the program counter to cause a branch to a new location.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#REL">Relative</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$50</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">2 (+1 if branch succeeds<BR>
+2 if to a new page)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#BVS">BVS</A></P>
<H3><A NAME="BVS"></A>BVS - Branch if Overflow Set</H3>
<P>If the overflow flag is set then add the relative displacement
to the program counter to cause a branch to a new location.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#REL">Relative</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$70</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">2 (+1 if branch succeeds<BR>
+2 if to a new page)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#BVC">BVC</A></P>
<H3><A NAME="CLC"></A>CLC - Clear Carry Flag</H3>
<P>C = 0</P>
<P>Set the carry flag to zero.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Set to 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$18</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#SEC">SEC</A></P>
<H3><A NAME="CLD"></A>CLD - Clear Decimal Mode</H3>
<P>D = 0</P>
<P>Sets the decimal mode flag to zero.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Set to 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$D8</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P><B>NB</B>:<BR>
The state of the decimal flag is uncertain when the CPU is powered
up and it is not reset when an interrupt is generated. In both
cases you should include an explicit CLD to ensure that the flag
is cleared before performing addition or subtraction.</P>
<P>See also: <A HREF="#SED">SED</A></P>
<H3><A NAME="CLI"></A>CLI - Clear Interrupt Disable</H3>
<P>I = 0</P>
<P>Clears the interrupt disable flag allowing normal interrupt
requests to be serviced.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Set to 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$58</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#SEI">SEI</A></P>
<H3><A NAME="CLV"></A>CLV - Clear Overflow Flag</H3>
<P>V = 0</P>
<P>Clears the overflow flag.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Set to 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$B8</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<H3><A NAME="CMP"></A>CMP - Compare</H3>
<P>Z,C,N = A-M</P>
<P>This instruction compares the contents of the accumulator with
another memory held value and sets the zero and carry flags as
appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Set if A &gt;= M</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if A = M</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of the result is set</TD>
</TR>
</TABLE>
<P><TABLE HEIGHT="228" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IMM">Immediate</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$C9</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">2</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$C5</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPX">Zero Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$D5</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$CD</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="24"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$DD</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABY">Absolute,Y</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$D9</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IDX">(Indirect,X)</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$C1</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">6</TD>
</TR>
<TR>
<TD HEIGHT="26"><A HREF="addressing.html#IDY">(Indirect),Y</A></TD>
<TD WIDTH="15%" HEIGHT="26">
<P><CENTER>$D1</CENTER></TD>
<TD WIDTH="15%" HEIGHT="26">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="26">5 (+1 if page crossed)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#CPX">CPX</A>, <A HREF="#CPY">CPY</A></P>
<H3><A NAME="CPX"></A>CPX - Compare X Register</H3>
<P>Z,C,N = X-M</P>
<P>This instruction compares the contents of the X register with
another memory held value and sets the zero and carry flags as
appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Set if X &gt;= M</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if X = M</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of the result is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IMM">Immediate</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$E0</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">2</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$E4</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$EC</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#CMP">CMP</A>, <A HREF="#CPY">CPY</A></P>
<H3><A NAME="CPY"></A>CPY - Compare Y Register</H3>
<P>Z,C,N = Y-M</P>
<P>This instruction compares the contents of the Y register with
another memory held value and sets the zero and carry flags as
appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Set if Y &gt;= M</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if Y = M</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of the result is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IMM">Immediate</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$C0</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">2</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$C4</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$CC</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#CMP">CMP</A>, <A HREF="#CPX">CPX</A></P>
<H3><A NAME="DEC"></A>DEC - Decrement Memory</H3>
<P>M,Z,N = M-1</P>
<P>Subtracts one from the value held at a specified memory location
setting the zero and negative flags as appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if result is zero</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of the result is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$C6</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">5</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPX">Zero Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$D6</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">6</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$CE</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">6</TD>
</TR>
<TR>
<TD HEIGHT="24"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$DE</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">7</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#DEX">DEX</A>, <A HREF="#DEY">DEY</A></P>
<H3><A NAME="DEX"></A>DEX - Decrement X Register</H3>
<P>X,Z,N = X-1</P>
<P>Subtracts one from the X register setting the zero and negative
flags as appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if X is zero</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of X is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$CA</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#DEC">DEC</A>, <A HREF="#DEY">DEY</A></P>
<H3><A NAME="DEY"></A>DEY - Decrement Y Register</H3>
<P>Y,Z,N = Y-1</P>
<P>Subtracts one from the Y register setting the zero and negative
flags as appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if Y is zero</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of Y is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$88</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#DEC">DEC</A>, <A HREF="#DEX">DEX</A></P>
<H3><A NAME="EOR"></A>EOR - Exclusive OR</H3>
<P>A,Z,N = A^M</P>
<P>An exclusive OR is performed, bit by bit, on the accumulator
contents using the contents of a byte of memory.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Set if bit 7 set</TD>
</TR>
</TABLE>
<P><TABLE HEIGHT="229" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#IMM">Immediate</A></TD>
<TD WIDTH="15%">
<P><CENTER>$49</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>2</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#ZPG">Zero
Page</A></TD>
<TD WIDTH="15%">
<P><CENTER>$45</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>3</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#ZPX">Zero
Page,X</A></TD>
<TD WIDTH="15%">
<P><CENTER>$55</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>4</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%">
<P><CENTER>$4D</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>3</CENTER></TD>
<TD>4</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%">
<P><CENTER>$5D</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>3</CENTER></TD>
<TD>4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#ABY">Absolute,Y</A></TD>
<TD WIDTH="15%">
<P><CENTER>$59</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>3</CENTER></TD>
<TD>4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="25"><A HREF="addressing.html#IDX">(Indirect,X)</A></TD>
<TD WIDTH="15%">
<P><CENTER>$41</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>6</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="26"><A HREF="addressing.html#IDY">(Indirect),Y</A></TD>
<TD WIDTH="15%">
<P><CENTER>$51</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>5 (+1 if page crossed)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#AND">AND</A>, <A HREF="#ORA">ORA</A></P>
<H3><A NAME="INC"></A>INC - Increment Memory</H3>
<P>M,Z,N = M+1</P>
<P>Adds one to the value held at a specified memory location setting
the zero and negative flags as appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if result is zero</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of the result is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$E6</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">5</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPX">Zero Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$F6</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">6</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$EE</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">6</TD>
</TR>
<TR>
<TD HEIGHT="24"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$FE</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">7</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#INX">INX</A>, <A HREF="#INY">INY</A></P>
<H3><A NAME="INX"></A>INX - Increment X Register</H3>
<P>X,Z,N = X+1</P>
<P>Adds one to the X register setting the zero and negative flags
as appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if X is zero</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of X is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$E8</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#INC">INC</A>, <A HREF="#INY">INY</A></P>
<H3><A NAME="INY"></A>INY - Increment Y Register</H3>
<P>Y,Z,N = Y+1</P>
<P>Adds one to the Y register setting the zero and negative flags
as appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if Y is zero</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of Y is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$C8</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#INC">INC</A>, <A HREF="#INX">INX</A></P>
<H3><A NAME="JMP"></A>JMP - Jump</H3>
<P>Sets the program counter to the address specified by the operand.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="179" HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$4C</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD WIDTH="179" HEIGHT="24">3</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IND">Indirect</A>&nbsp;</TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$6C</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD WIDTH="179" HEIGHT="24">5</TD>
</TR>
</TABLE>
<P>NB:<BR>
An original 6502 has does not correctly fetch the target address
if the indirect vector falls on a page boundary (e.g. $xxFF where
xx is any value from $00 to $FF). In this case fetches the LSB
from $xxFF as expected but takes the MSB from $xx00. This is fixed
in some later chips like the 65SC02 so for compatibility always
ensure the indirect vector is not at the end of the page.</P>
<H3><A NAME="JSR"></A>JSR - Jump to Subroutine</H3>
<P>The JSR instruction pushes the address (minus one) of the return
point on to the stack and then sets the program counter to the
target memory address.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="179" HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$20</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD WIDTH="179" HEIGHT="24">6</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#RTS">RTS</A></P>
<H3><A NAME="LDA"></A>LDA - Load Accumulator</H3>
<P>A,Z,N = M</P>
<P>Loads a byte of memory into the accumulator setting the zero
and negative flags as appropriate.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of A is set</TD>
</TR>
</TABLE>
<P><TABLE HEIGHT="228" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IMM">Immediate</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$A9</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">2</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$A5</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPX">Zero Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$B5</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$AD</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="24"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$BD</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABY">Absolute,Y</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$B9</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IDX">(Indirect,X)</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$A1</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">6</TD>
</TR>
<TR>
<TD HEIGHT="26"><A HREF="addressing.html#IDY">(Indirect),Y</A></TD>
<TD WIDTH="15%" HEIGHT="26">
<P><CENTER>$B1</CENTER></TD>
<TD WIDTH="15%" HEIGHT="26">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="26">5 (+1 if page crossed)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#LDX">LDX</A>, <A HREF="#LDY">LDY</A></P>
<H3><A NAME="LDX"></A>LDX - Load X Register</H3>
<P>X,Z,N = M</P>
<P>Loads a byte of memory into the X register setting the zero
and negative flags as appropriate.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if X = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of X is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IMM">Immediate</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$A2</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">2</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$A6</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPY">Zero Page,Y</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$B6</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$AE</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABY">Absolute,Y</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$BE</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4 (+1 if page crossed)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#LDA">LDA</A>, <A HREF="#LDY">LDY</A></P>
<H3><A NAME="LDY"></A>LDY - Load Y Register</H3>
<P>Y,Z,N = M</P>
<P>Loads a byte of memory into the Y register setting the zero
and negative flags as appropriate.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if Y = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of Y is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IMM">Immediate</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$A0</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">2</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$A4</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPX">Zero Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$B4</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$AC</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$BC</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4 (+1 if page crossed)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#LDA">LDA</A>, <A HREF="#LDX">LDX</A></P>
<H3><A NAME="LSR"></A>LSR - Logical Shift Right</H3>
<P>A,C,Z,N = A/2 or M,C,Z,N = M/2</P>
<P>Each of the bits in A or M is shift one place to the right.
The bit that was in bit 0 is shifted into the carry flag. Bit
7 is set to zero.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Set to contents of old bit 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Set if result = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Set if bit 7 of the result is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Accumulator</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$4A</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ZPG">Zero
Page</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$46</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">5</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ZPX">Zero
Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$56</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">6</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$4E</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">6</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$5E</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">7</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#ASL">ASL</A>, <A HREF="#ROL">ROL</A>, <A
HREF="#ROR">ROR</A></P>
<H3><A NAME="NOP"></A>NOP - No Operation</H3>
<P>The NOP instruction causes no changes to the processor other
than the normal incrementing of the program counter to the next
instruction.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$EA</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<H3><A NAME="ORA"></A>ORA - Logical Inclusive OR</H3>
<P>A,Z,N = A|M</P>
<P>An inclusive OR is performed, bit by bit, on the accumulator
contents using the contents of a byte of memory.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Set if bit 7 set</TD>
</TR>
</TABLE>
<P><TABLE HEIGHT="229" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IMM">Immediate</A></TD>
<TD WIDTH="15%">
<P><CENTER>$09</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>2</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%">
<P><CENTER>$05</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPX">Zero Page,X</A></TD>
<TD WIDTH="15%">
<P><CENTER>$15</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%">
<P><CENTER>$0D</CENTER></TD>
<TD WIDTH="15%">
<P align="center">3</TD>
<TD>4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%">
<P><CENTER>$1D</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>3</CENTER></TD>
<TD>4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABY">Absolute,Y</A></TD>
<TD WIDTH="15%">
<P><CENTER>$19</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>3</CENTER></TD>
<TD>4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IDX">(Indirect,X)</A></TD>
<TD WIDTH="15%">
<P><CENTER>$01</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>6</TD>
</TR>
<TR>
<TD HEIGHT="26"><A HREF="addressing.html#IDY">(Indirect),Y</A></TD>
<TD WIDTH="15%">
<P><CENTER>$11</CENTER></TD>
<TD WIDTH="15%">
<P><CENTER>2</CENTER></TD>
<TD>5 (+1 if page crossed)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#AND">AND</A>, <A HREF="#EOR">EOR</A></P>
<H3><A NAME="PHA"></A>PHA - Push Accumulator</H3>
<P>Pushes a copy of the accumulator on to the stack.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$48</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">3</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#PLA">PLA</A></P>
<H3><A NAME="PHP"></A>PHP - Push Processor Status</H3>
<P>Pushes a copy of the status flags on to the stack.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$08</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">3</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#PLP">PLP</A></P>
<H3><A NAME="PLA"></A>PLA - Pull Accumulator</H3>
<P>Pulls an 8 bit value from the stack and into the accumulator.
The zero and negative flags are set as appropriate.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of A is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$68</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">4</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#PHA">PHA</A></P>
<H3><A NAME="PLP"></A>PLP - Pull Processor Status</H3>
<P>Pulls an 8 bit value from the stack and into the processor
flags. The flags will take on new states as determined by the
value pulled.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$28</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">4</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#PHP">PHP</A></P>
<H3><A NAME="ROL"></A>ROL - Rotate Left</H3>
<P>Move each of the bits in either A or M one place to the left.
Bit 0 is filled with the current value of the carry flag whilst
the old bit 7 becomes the new carry flag value.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Set to contents of old bit 7</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Set if bit 7 of the result is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Accumulator</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$2A</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ZPG">Zero
Page</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$26</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">5</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ZPX">Zero
Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$36</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">6</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$2E</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">6</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$3E</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">7</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#ASL">ASL</A>, <A HREF="#LSR">LSR</A>, <A
HREF="#ROR">ROR</A></P>
<H3><A NAME="ROR"></A>ROR - Rotate Right</H3>
<P>Move each of the bits in either A or M one place to the right.
Bit 7 is filled with the current value of the carry flag whilst
the old bit 0 becomes the new carry flag value.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Set to contents of old bit 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Set if bit 7 of the result is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Accumulator</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$6A</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ZPG">Zero
Page</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$66</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">5</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ZPX">Zero
Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$76</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="24">6</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$6E</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">6</TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$7E</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">7</TD>
</TR>
</TABLE>
<P>See also <A HREF="#ASL">ASL</A>, <A HREF="#LSR">LSR</A>, <A
HREF="#ROL">ROL</A></P>
<H3><A NAME="RTI"></A>RTI - Return from Interrupt</H3>
<P>The RTI instruction is used at the end of an interrupt processing
routine. It pulls the processor flags from the stack followed
by the program counter.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Set from stack</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$40</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">6</TD>
</TR>
</TABLE>
<H3><A NAME="RTS"></A>RTS - Return from Subroutine</H3>
<P>The RTS instruction is used at the end of a subroutine to return
to the calling routine. It pulls the program counter (minus one)
from the stack.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$60</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">6</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#JSR">JSR</A></P>
<H3><A NAME="SBC"></A>SBC - Subtract with Carry</H3>
<P>A,Z,C,N = A-M-(1-C)</P>
<P>This instruction subtracts the contents of a memory location
to the accumulator together with the not of the carry bit. If
overflow occurs the carry bit is clear, this enables multiple
byte subtraction to be performed.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Clear if overflow in bit 7</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Set if sign bit is incorrect</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 set</TD>
</TR>
</TABLE>
<P><TABLE HEIGHT="228" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IMM">Immediate</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$E9</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">2</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$E5</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPX">Zero Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$F5</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$ED</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="24"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$FD</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABY">Absolute,Y</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$F9</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4 (+1 if page crossed)</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IDX">(Indirect,X)</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$E1</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">6</TD>
</TR>
<TR>
<TD HEIGHT="26"><A HREF="addressing.html#IDY">(Indirect),Y</A></TD>
<TD WIDTH="15%" HEIGHT="26">
<P><CENTER>$F1</CENTER></TD>
<TD WIDTH="15%" HEIGHT="26">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="26">5 (+1 if page crossed)</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#ADC">ADC</A></P>
<H3><A NAME="SEC"></A>SEC - Set Carry Flag</H3>
<P>C = 1</P>
<P>Set the carry flag to one.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Set to 1</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$38</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#CLC">CLC</A></P>
<H3><A NAME="SED"></A>SED - Set Decimal Flag</H3>
<P>D = 1</P>
<P>Set the decimal mode flag to one.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Set to 1</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$F8</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#CLD">CLD</A></P>
<H3><A NAME="SEI"></A>SEI - Set Interrupt Disable</H3>
<P>I = 1</P>
<P>Set the interrupt disable flag to one.</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="243">Set to 1</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="243">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$78</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#CLI">CLI</A></P>
<H3><A NAME="STA"></A>STA - Store Accumulator</H3>
<P>M = A</P>
<P>Stores the contents of the accumulator into memory.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$85</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPX">Zero Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$95</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$8D</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="24"><A HREF="addressing.html#ABX">Absolute,X</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$9D</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="24">5</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABY">Absolute,Y</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$99</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">5</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#IDX">(Indirect,X)</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$81</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">6</TD>
</TR>
<TR>
<TD HEIGHT="26"><A HREF="addressing.html#IDY">(Indirect),Y</A></TD>
<TD WIDTH="15%" HEIGHT="26">
<P><CENTER>$91</CENTER></TD>
<TD WIDTH="15%" HEIGHT="26">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="26">6</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#STX">STX</A>, <A HREF="#STY">STY</A></P>
<H3><A NAME="STX"></A>STX - Store X Register</H3>
<P>M = X</P>
<P>Stores the contents of the X register into memory.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$86</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPY">Zero Page,Y</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$96</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$8E</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#STA">STA</A>, <A HREF="#STY">STY</A></P>
<H3><A NAME="STY"></A>STY - Store Y Register</H3>
<P>M = Y</P>
<P>Stores the contents of the Y register into memory.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="25"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD WIDTH="34%" HEIGHT="25"><B>Cycles</B></TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPG">Zero Page</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$84</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">3</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ZPX">Zero Page,X</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$94</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>2</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
<TR>
<TD HEIGHT="25"><A HREF="addressing.html#ABS">Absolute</A></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>$8C</CENTER></TD>
<TD WIDTH="15%" HEIGHT="25">
<P><CENTER>3</CENTER></TD>
<TD HEIGHT="25">4</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#STA">STA</A>, <A HREF="#STX">STX</A></P>
<H3><A NAME="TAX"></A>TAX - Transfer Accumulator to X</H3>
<P>X = A</P>
<P>Copies the current contents of the accumulator into the X register
and sets the zero and negative flags as appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if X = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of X is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$AA</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#TXA">TXA</A></P>
<H3><A NAME="TAY"></A>TAY - Transfer Accumulator to Y</H3>
<P>Y = A</P>
<P>Copies the current contents of the accumulator into the Y register
and sets the zero and negative flags as appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if Y = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of Y is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$A8</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#TAY">TYA</A></P>
<H3><A NAME="TSX"></A>TSX - Transfer Stack Pointer to X</H3>
<P>X = S</P>
<P>Copies the current contents of the stack register into the
X register and sets the zero and negative flags as appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if X = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of X is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$BA</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#TXS">TXS</A></P>
<H3><A NAME="TXA"></A>TXA - Transfer X to Accumulator</H3>
<P>A = X</P>
<P>Copies the current contents of the X register into the accumulator
and sets the zero and negative flags as appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of A is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$8A</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#TAX">TAX</A></P>
<H3><A NAME="TXS"></A>TXS - Transfer X to Stack Pointer</H3>
<P>S = X</P>
<P>Copies the current contents of the X register into the stack
register.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="35%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="180">Not affected</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$9A</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#TSX">TSX</A></P>
<H3><A NAME="TYA"></A>TYA - Transfer Y to Accumulator</H3>
<P>A = Y</P>
<P>Copies the current contents of the Y register into the accumulator
and sets the zero and negative flags as appropriate.</P>
<P>Processor Status after use:</P>
<P><TABLE HEIGHT="171" CELLSPACING="0" CELLPADDING="0" WIDTH="450"
BORDER="1">
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#C">C</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#C">Carry Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#Z">Z</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#Z">Zero Flag</A></TD>
<TD WIDTH="50%">Set if A = 0</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#I">I</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#I">Interrupt Disable</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#D">D</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#D">Decimal Mode Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#B">B</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#B">Break Command</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#V">V</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#V">Overflow Flag</A></TD>
<TD WIDTH="50%">Not affected</TD>
</TR>
<TR>
<TD ALIGN="MIDDLE" WIDTH="5%" HEIGHT="24"><A HREF="registers.html#N">N</A></TD>
<TD WIDTH="45%"><A HREF="registers.html#N">Negative Flag</A></TD>
<TD WIDTH="50%">Set if bit 7 of A is set</TD>
</TR>
</TABLE>
<P><TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="450" BORDER="1">
<TR>
<TD WIDTH="30%" HEIGHT="24"><B>Addressing Mode</B></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Opcode</B></CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER><B>Bytes</B></CENTER></TD>
<TD HEIGHT="24"><B>Cycles</B></TD>
</TR>
<TR>
<TD WIDTH="30%" HEIGHT="24"><A HREF="addressing.html#IMP">Implied</A></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>$98</CENTER></TD>
<TD WIDTH="15%" HEIGHT="24">
<P><CENTER>1</CENTER></TD>
<TD HEIGHT="24">2</TD>
</TR>
</TABLE>
<P>See also: <A HREF="#TAY">TAY</A></P>
<P><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%"
HEIGHT="30">
<TR>
<TD WIDTH="25%" BGCOLOR="#aaaaff">&nbsp;<A HREF="algorithms.html">&lt;&lt;
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<TD WIDTH="25%" BGCOLOR="#aaaaff">
<P><CENTER><A HREF="../index.html" TARGET="_parent">Home</A></CENTER></TD>
<TD WIDTH="25%" BGCOLOR="#aaaaff">
<P><CENTER><A HREF="index.html">Contents</A></CENTER></TD>
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