mirror of
https://github.com/0ldsk00l/nestopia.git
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119 lines
2.9 KiB
C++
119 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) 2022 Rupert Carmichael
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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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/* References:
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https://github.com/NovaSquirrel/Mesen-X/blob/master/Core/Mapper400.h
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*/
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#include "NstBoard.hpp"
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#include "NstBoardUnlRetX7Gbl.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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void RetX7Gbl::SubReset(bool)
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{
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Map( 0x7800U, 0x7FFFU, &RetX7Gbl::Poke_7800 );
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Map( 0x8000U, 0xBFFFU, &RetX7Gbl::Poke_8000 );
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Map( 0xC000U, 0xFFFFU, &RetX7Gbl::Poke_C000 );
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regs[0] = 0x80;
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regs[1] = 0x00;
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UpdatePrg();
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}
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void RetX7Gbl::SubLoad(State::Loader& state,const dword baseChunk)
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{
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if (baseChunk == AsciiId<'R','X','G'>::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<3> data( state );
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regs[0] = data[0];
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regs[1] = data[1];
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led = data[2];
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}
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state.End();
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}
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}
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UpdatePrg();
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}
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void RetX7Gbl::SubSave(State::Saver& state) const
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{
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state.Begin( AsciiId<'R','X','G'>::V );
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const byte data[3] =
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{
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regs[0], regs[1], led
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};
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state.Begin( AsciiId<'R','E','G'>::V ).Write( data ).End();
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state.End();
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}
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void RetX7Gbl::UpdatePrg()
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{
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prg.SwapBank<SIZE_16K,0x0000>( (regs[0] & 0x78) | (regs[1] & 0x7) );
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prg.SwapBank<SIZE_16K,0x4000>( (regs[0] & 0x78) | 0x7 );
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if (regs[0] != 0x80)
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{
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ppu.SetMirroring( regs[0] & 0x20 ? Ppu::NMT_H : Ppu::NMT_V );
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}
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}
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NES_POKE_D(RetX7Gbl,7800)
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{
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regs[0] = data;
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UpdatePrg();
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}
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NES_POKE_D(RetX7Gbl,8000)
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{
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led = data;
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}
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NES_POKE_D(RetX7Gbl,C000)
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{
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regs[1] = data;
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UpdatePrg();
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chr.SwapBank<SIZE_8K,0x0000>( (data >> 5) & 0x3 );
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}
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}
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}
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}
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}
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