nestopia/source/core/board/NstBoardKayH2288.cpp
2012-09-02 13:13:55 -04:00

139 lines
3.4 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 "NstBoardMmc3.hpp"
#include "NstBoardKay.hpp"
namespace Nes
{
namespace Core
{
namespace Boards
{
namespace Kay
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
void H2288::SubReset(const bool hard)
{
if (hard)
{
exRegs[0] = 0;
exRegs[1] = 0;
}
Mmc3::SubReset( hard );
Map( 0x5000U, 0x57FFU, &H2288::Peek_5000 );
Map( 0x5800U, 0x5FFFU, &H2288::Peek_5000, &H2288::Poke_5800 );
for (uint i=0x8000; i < 0x9000; i += 0x2)
Map( i, &H2288::Poke_8000 );
}
void H2288::SubLoad(State::Loader& state,const dword baseChunk)
{
if (baseChunk == AsciiId<'K','H','2'>::V)
{
while (const dword chunk = state.Begin())
{
if (chunk == AsciiId<'R','E','G'>::V)
{
State::Loader::Data<2> data( state );
exRegs[0] = data[0];
exRegs[1] = data[1];
}
state.End();
}
}
else
{
Mmc3::SubLoad( state, baseChunk );
}
}
void H2288::SubSave(State::Saver& state) const
{
Mmc3::SubSave( state );
const byte data[2] =
{
exRegs[0],
exRegs[1]
};
state.Begin( AsciiId<'K','H','2'>::V ).Begin( AsciiId<'R','E','G'>::V ).Write( data ).End().End();
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
void NST_FASTCALL H2288::UpdatePrg(uint address,uint bank)
{
if (!(exRegs[0] & 0x40))
Mmc3::UpdatePrg( address, bank );
}
NES_PEEK_A(H2288,5000)
{
return (address >> 8 & 0xFE) | (((~address & 0x1) & (address >> 8 & 0x1)) ^ 0x1);
}
NES_POKE_AD(H2288,5800)
{
address &= 0x1;
if (exRegs[address] != data)
{
exRegs[address] = data;
if (exRegs[0] & 0x40)
{
data = (exRegs[0] & 0x5) | (exRegs[0] >> 2 & 0x2) | (exRegs[0] >> 2 & 0x8);
address = exRegs[0] >> 1 & 0x1;
prg.SwapBanks<SIZE_16K,0x0000>( data & ~address, data | address );
}
else
{
Mmc3::UpdatePrg();
}
}
}
NES_POKE_AD(H2288,8000)
{
static const byte security[8] = {0,3,1,5,6,7,2,4};
Mmc3::NES_DO_POKE(8000,address,(data & 0xC0) | security[data & 0x07]);
}
}
}
}
}