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////////////////////////////////////////////////////////////////////////////////////////
//
// Nestopia - NES/Famicom emulator written in C++
//
// Copyright (C) 2003-2008 Martin Freij
// Copyright (C) 2020-2024 Rupert Carmichael
//
// This file is part of Nestopia.
//
// Nestopia is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// Nestopia is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Nestopia; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
////////////////////////////////////////////////////////////////////////////////////////
// Reference: https://github.com/TASEmulators/fceux/blob/master/src/boards/354.cpp
#include "NstBoard.hpp"
#include "NstBoardUnlFam250Schi24.hpp"
namespace Nes
{
namespace Core
{
namespace Boards
{
namespace Unlicensed
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
void Fam250Schi24::SubReset(bool)
{
bankreg = 0;
Map( 0x6000U, 0x7FFFU, &Fam250Schi24::Peek_6000 );
Map( submapper == 1 ? 0xE000U : 0xF000U, 0xFFFFU, &Fam250Schi24::Poke_F000 );
prg.SwapBank<SIZE_32K,0x0000>(0);
}
void Fam250Schi24::SubLoad(State::Loader& state,const dword baseChunk)
{
NST_VERIFY( (baseChunk == AsciiId<'F','S','C'>::V) );
if (baseChunk == AsciiId<'F','S','C'>::V)
{
while (const dword chunk = state.Begin())
{
if (chunk == AsciiId<'R','E','G'>::V)
bankreg = state.Read8();
state.End();
}
}
}
void Fam250Schi24::SubSave(State::Saver& state) const
{
state.Begin( AsciiId<'F','S','C'>::V ).Begin( AsciiId<'R','E','G'>::V ).Write8( bankreg ).End().End();
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
NES_PEEK_A(Fam250Schi24,6000)
{
return *(prg.Source().Mem(bankreg * SIZE_8K) + (address & 0x1FFF));
}
NES_POKE_AD(Fam250Schi24,F000)
{
const uint bank = (data & 0x3F) | ((address << 2) & 0x40) | ((address >> 5) & 0x80);
ppu.SetMirroring( (data & 0x40) ? Ppu::NMT_H : Ppu::NMT_V );
chr.Source().WriteEnable( !(address & 0x08) );
switch (address & 0x07)
{
case 0: case 4:
prg.SwapBank<SIZE_32K,0x0000>(bank >> 1);
break;
case 1:
prg.SwapBank<SIZE_16K,0x0000>(bank);
prg.SwapBank<SIZE_16K,0x4000>(bank | 0x07);
break;
case 2: case 6:
prg.SwapBank<SIZE_8K,0x0000>(bank << 1 | data >> 7);
prg.SwapBank<SIZE_8K,0x2000>(bank << 1 | data >> 7);
prg.SwapBank<SIZE_8K,0x4000>(bank << 1 | data >> 7);
prg.SwapBank<SIZE_8K,0x6000>(bank << 1 | data >> 7);
break;
case 3: case 7:
prg.SwapBank<SIZE_16K,0x0000>(bank);
prg.SwapBank<SIZE_16K,0x4000>(bank);
break;
case 5:
bankreg = bank << 1 | data >> 7;
prg.SwapBank<SIZE_32K,0x0000>(bank >> 1 | 0x03);
break;
}
}
}
}
}
}
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