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52 lines
1.1 KiB
C++
52 lines
1.1 KiB
C++
auto V30MZ::instructionDecimalAdjust(bool negate) -> void {
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wait(9);
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uint8 al = r.al;
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if(r.f.h || ((al & 0x0f) > 0x09)) {
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r.al += negate ? -0x06 : 0x06;
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r.f.h = 1;
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}
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if(r.f.c || (al > 0x99)) {
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r.al += negate ? -0x60 : 0x60;
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r.f.c = 1;
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}
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r.f.s = r.al & 0x80;
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r.f.z = r.al == 0;
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r.f.p = parity(r.al);
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}
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auto V30MZ::instructionAsciiAdjust(bool negate) -> void {
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wait(8);
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if(r.f.h || ((r.al & 0x0f) > 0x09)) {
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r.al += negate ? -0x06 : 0x06;
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r.ah += negate ? -0x01 : 0x01;
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r.f.h = 1;
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r.f.c = 1;
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} else {
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r.f.h = 0;
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r.f.c = 0;
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}
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r.al &= 0x0f;
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}
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auto V30MZ::instructionAdjustAfterMultiply() -> void {
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wait(16);
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auto imm = fetch();
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if(imm == 0) return interrupt(0);
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//NEC CPUs do not honor the immediate and always use (base) 10
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r.ah = r.al / 10;
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r.al %= imm;
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r.f.p = parity(r.al);
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r.f.s = r.ax & 0x8000;
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r.f.z = r.ax == 0;
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}
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auto V30MZ::instructionAdjustAfterDivide() -> void {
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wait(5);
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auto imm = fetch();
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//NEC CPUs do not honor the immediate and always use (base) 10
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r.al += r.ah * 10;
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r.ah = 0;
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r.f.p = parity(r.al);
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r.f.s = r.ax & 0x8000;
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r.f.z = r.ax == 0;
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}
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