mirror of
https://github.com/0ldsk00l/nestopia.git
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149 lines
3.5 KiB
C++
149 lines
3.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////////////
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//
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// Nestopia - NES/Famicom emulator written in C++
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//
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// Copyright (C) 2003-2008 Martin Freij
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//
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// This file is part of Nestopia.
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//
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// Nestopia is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// Nestopia is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Nestopia; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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////////////////////////////////////////////////////////////////////////////////////////
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#include "NstBoard.hpp"
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#include "NstBoardMmc6.hpp"
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#include "../NstFile.hpp"
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namespace Nes
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{
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namespace Core
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{
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namespace Boards
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{
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#ifdef NST_MSVC_OPTIMIZE
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#pragma optimize("s", on)
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#endif
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Mmc6::Mmc6(const Context& c)
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: Mmc3(c,REV_A) {}
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void Mmc6::SubReset(const bool hard)
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{
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Mmc3::SubReset( hard );
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reg = 0;
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Map( 0x6000U, 0x6FFFU, NOP_POKE );
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Map( 0x7000U, 0x7FFFU, &Mmc6::Peek_7000, &Mmc6::Poke_7000 );
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for (uint i=0xA001; i < 0xC000; i += 0x2)
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Map( i, &Mmc6::Poke_A001 );
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}
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void Mmc6::Load(File& file)
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{
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if (board.HasBattery())
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file.Load( File::BATTERY, ram, sizeof(ram) );
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}
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void Mmc6::Save(File& file) const
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{
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if (board.HasBattery())
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file.Save( File::BATTERY, ram, sizeof(ram) );
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}
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void Mmc6::SubLoad(State::Loader& state,const dword baseChunk)
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{
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if (baseChunk == AsciiId<'M','M','6'>::V)
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{
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while (const dword chunk = state.Begin())
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{
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switch (chunk)
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{
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case AsciiId<'R','E','G'>::V:
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reg = state.Read8();
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break;
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case AsciiId<'R','A','M'>::V:
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state.Uncompress( ram );
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break;
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}
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state.End();
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}
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}
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else
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{
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Mmc3::SubLoad( state, baseChunk );
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}
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}
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void Mmc6::SubSave(State::Saver& state) const
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{
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Mmc3::SubSave( state );
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state.Begin( AsciiId<'M','M','6'>::V );
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state.Begin( AsciiId<'R','E','G'>::V ).Write8( reg ).End();
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state.Begin( AsciiId<'R','A','M'>::V ).Compress( ram ).End();
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state.End();
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}
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#ifdef NST_MSVC_OPTIMIZE
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#pragma optimize("", on)
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#endif
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inline bool Mmc6::IsRamEnabled() const
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{
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return reg & (RAM_LO_BANK_ENABLED|RAM_HI_BANK_ENABLED);
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}
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inline bool Mmc6::IsRamReadable(uint address) const
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{
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return (reg >> (address >> 8 & 0x2)) & 0x20;
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}
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inline bool Mmc6::IsRamWritable(uint address) const
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{
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return ((reg >> (address >> 8 & 0x2)) & 0x30) == 0x30;
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}
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NES_POKE_AD(Mmc6,7000)
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{
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NST_VERIFY( IsRamWritable(address) );
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if (IsRamWritable( address ))
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ram[address & 0x3FF] = data;
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}
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NES_PEEK_A(Mmc6,7000)
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{
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NST_VERIFY( IsRamEnabled() && IsRamReadable(address) );
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if (IsRamEnabled())
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return IsRamReadable(address) ? ram[address & 0x3FF] : 0x00;
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else
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return address >> 8;
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}
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NES_POKE_D(Mmc6,A001)
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{
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if ((reg & 0x1) | (regs.ctrl0 & RAM_ENABLE))
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reg = data | 0x1;
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}
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}
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}
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}
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