mirror of
https://github.com/0ldsk00l/nestopia.git
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139 lines
3.4 KiB
C++
139 lines
3.4 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 "NstBoardMmc3.hpp"
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#include "NstBoardKay.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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namespace Kay
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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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void H2288::SubReset(const bool hard)
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{
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if (hard)
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{
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exRegs[0] = 0;
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exRegs[1] = 0;
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}
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Mmc3::SubReset( hard );
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Map( 0x5000U, 0x57FFU, &H2288::Peek_5000 );
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Map( 0x5800U, 0x5FFFU, &H2288::Peek_5000, &H2288::Poke_5800 );
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for (uint i=0x8000; i < 0x9000; i += 0x2)
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Map( i, &H2288::Poke_8000 );
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}
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void H2288::SubLoad(State::Loader& state,const dword baseChunk)
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{
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if (baseChunk == AsciiId<'K','H','2'>::V)
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{
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while (const dword chunk = state.Begin())
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{
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if (chunk == AsciiId<'R','E','G'>::V)
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{
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State::Loader::Data<2> data( state );
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exRegs[0] = data[0];
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exRegs[1] = data[1];
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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 H2288::SubSave(State::Saver& state) const
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{
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Mmc3::SubSave( state );
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const byte data[2] =
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{
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exRegs[0],
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exRegs[1]
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};
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state.Begin( AsciiId<'K','H','2'>::V ).Begin( AsciiId<'R','E','G'>::V ).Write( data ).End().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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void NST_FASTCALL H2288::UpdatePrg(uint address,uint bank)
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{
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if (!(exRegs[0] & 0x40))
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Mmc3::UpdatePrg( address, bank );
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}
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NES_PEEK_A(H2288,5000)
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{
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return (address >> 8 & 0xFE) | (((~address & 0x1) & (address >> 8 & 0x1)) ^ 0x1);
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}
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NES_POKE_AD(H2288,5800)
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{
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address &= 0x1;
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if (exRegs[address] != data)
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{
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exRegs[address] = data;
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if (exRegs[0] & 0x40)
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{
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data = (exRegs[0] & 0x5) | (exRegs[0] >> 2 & 0x2) | (exRegs[0] >> 2 & 0x8);
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address = exRegs[0] >> 1 & 0x1;
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prg.SwapBanks<SIZE_16K,0x0000>( data & ~address, data | address );
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}
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else
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{
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Mmc3::UpdatePrg();
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}
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}
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}
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NES_POKE_AD(H2288,8000)
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{
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static const byte security[8] = {0,3,1,5,6,7,2,4};
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Mmc3::NES_DO_POKE(8000,address,(data & 0xC0) | security[data & 0x07]);
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}
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}
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}
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}
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}
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