mirror of
https://github.com/0ldsk00l/nestopia.git
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100 lines
2.9 KiB
C++
100 lines
2.9 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 "NstBoardBmcCh001.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 Bmc
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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 Ch001::SubReset(const bool hard)
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{
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Map( 0x8000U, 0xBFFFU, &Ch001::Peek_8000, &Ch001::Poke_8000 );
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Map( 0x8000U, 0xFFFFU, &Ch001::Poke_8000 );
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openBus = false;
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if (hard)
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NES_DO_POKE(8000,0x8000,0x00);
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}
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void Ch001::SubLoad(State::Loader& state,const dword baseChunk)
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{
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NST_VERIFY( baseChunk == (AsciiId<'B','P','F'>::V) );
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if (baseChunk == AsciiId<'B','P','F'>::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<'I','R','Q'>::V)
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openBus = state.Read8() & 0x1;
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state.End();
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}
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}
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}
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void Ch001::SubSave(State::Saver& state) const
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{
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state.Begin( AsciiId<'B','P','F'>::V ).Begin( AsciiId<'R','E','G'>::V ).Write8( openBus ).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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NES_PEEK_A(Ch001,8000)
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{
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return !openBus ? prg.Peek( address - 0x8000 ) : (address >> 8);
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}
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NES_POKE_A(Ch001,8000)
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{
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openBus = ((address & 0x300) == 0x300);
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prg.SwapBanks<SIZE_8K,0x0000>
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(
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(address >> 1 & 0x1FC) | ((address & 0x2) ? 0x0 : (address >> 1 & 0x2) | 0x0),
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(address >> 1 & 0x1FC) | ((address & 0x2) ? 0x1 : (address >> 1 & 0x2) | 0x1),
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(address >> 1 & 0x1FC) | ((address & 0x2) ? 0x2 : (address >> 1 & 0x2) | 0x0),
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(address & 0x800) ? (address >> 0 & 0x07C) | ((address & 0x6) ? 0x3 : 0x1) :
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(address >> 1 & 0x1FC) | ((address & 0x2) ? 0x3 : ((address >> 1 & 0x2) | 0x1))
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);
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ppu.SetMirroring( (address & 0x1) ? Ppu::NMT_H : Ppu::NMT_V );
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}
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}
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}
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}
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}
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