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123 lines
3 KiB
C++
123 lines
3 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 "NstBoardUnlN625092.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 Unlicensed
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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 N625092::SubReset(const bool hard)
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{
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Map( 0x8000U, 0xBFFFU, &N625092::Poke_8000 );
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Map( 0xC000U, 0xFFFFU, &N625092::Poke_C000 );
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if (hard)
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{
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regs[0] = 0;
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regs[1] = 0;
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UpdatePrg();
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}
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}
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void N625092::SubLoad(State::Loader& state,const dword baseChunk)
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{
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NST_VERIFY( baseChunk == (AsciiId<'N','6','2'>::V) );
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if (baseChunk == AsciiId<'N','6','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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regs[0] = data[0];
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regs[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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}
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void N625092::SubSave(State::Saver& state) const
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{
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const byte data[] =
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{
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regs[0], regs[1]
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};
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state.Begin( AsciiId<'N','6','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 N625092::UpdatePrg()
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{
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prg.SwapBanks<SIZE_16K,0x0000>
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(
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(regs[0] >> 1 & 0x38) | ((regs[0] & 0x1) ? (regs[0] & 0x80) ? regs[1] : (regs[1] & 0x6) | 0x0 : regs[1]),
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(regs[0] >> 1 & 0x38) | ((regs[0] & 0x1) ? (regs[0] & 0x80) ? 0x7 : (regs[1] & 0x6) | 0x1 : regs[1])
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);
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}
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NES_POKE_A(N625092,8000)
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{
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ppu.SetMirroring( (address & 0x1) ? Ppu::NMT_H : Ppu::NMT_V );
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address = address >> 1 & 0xFF;
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if (regs[0] != address)
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{
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regs[0] = address;
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UpdatePrg();
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}
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}
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NES_POKE_A(N625092,C000)
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{
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address &= 0x7;
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if (regs[1] != address)
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{
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regs[1] = address;
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UpdatePrg();
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}
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}
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}
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}
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}
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}
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