nestopia/source/core/board/NstBoardBmc22Games.cpp
2012-09-02 13:13:55 -04:00

100 lines
2.6 KiB
C++

////////////////////////////////////////////////////////////////////////////////////////
//
// Nestopia - NES/Famicom emulator written in C++
//
// Copyright (C) 2003-2008 Martin Freij
//
// 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
//
////////////////////////////////////////////////////////////////////////////////////////
#include "NstBoard.hpp"
#include "NstBoardBmc22Games.hpp"
namespace Nes
{
namespace Core
{
namespace Boards
{
namespace Bmc
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
void B22Games::SubReset(const bool hard)
{
if (hard)
romSwitch = 0;
else
romSwitch ^= 1;
if (romSwitch)
{
prg.SwapBanks<SIZE_16K,0x0000>( 0, 7 );
ppu.SetMirroring( Ppu::NMT_V );
}
else
{
prg.SwapBanks<SIZE_16K,0x0000>( 8, 39 );
}
Map( 0x8000U, 0xFFFFU, &B22Games::Poke_8000 );
}
void B22Games::SubLoad(State::Loader& state,const dword baseChunk)
{
NST_VERIFY( baseChunk == (AsciiId<'B','2','G'>::V) );
if (baseChunk == AsciiId<'B','2','G'>::V)
{
while (const dword chunk = state.Begin())
{
if (chunk == AsciiId<'R','E','G'>::V)
romSwitch = state.Read8() & 0x1;
state.End();
}
}
}
void B22Games::SubSave(State::Saver& state) const
{
state.Begin( AsciiId<'B','2','G'>::V ).Begin( AsciiId<'R','E','G'>::V ).Write8( romSwitch ).End().End();
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
NES_POKE_D(B22Games,8000)
{
if (romSwitch)
{
prg.SwapBank<SIZE_16K,0x0000>( data & 0x7 );
}
else
{
prg.SwapBanks<SIZE_16K,0x0000>( 8 + (data & 0x1F), (8 + (data & 0x1F)) | (~data >> 5 & 0x1) );
ppu.SetMirroring( (data & 0x40) ? Ppu::NMT_V : Ppu::NMT_H );
}
}
}
}
}
}