mirror of
https://github.com/0ldsk00l/nestopia.git
synced 2025-04-02 10:31:51 -04:00
125 lines
3.1 KiB
C++
125 lines
3.1 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 "NstBoardBmcCtc65.hpp"
|
|
|
|
namespace Nes
|
|
{
|
|
namespace Core
|
|
{
|
|
namespace Boards
|
|
{
|
|
namespace Bmc
|
|
{
|
|
#ifdef NST_MSVC_OPTIMIZE
|
|
#pragma optimize("s", on)
|
|
#endif
|
|
|
|
void Ctc65::SubReset(bool)
|
|
{
|
|
for (uint i=0x0000; i < 0x8000; i += 0x2)
|
|
{
|
|
Map( 0x8000 + i, &Ctc65::Peek_8000, &Ctc65::Poke_8000 );
|
|
Map( 0x8001 + i, &Ctc65::Peek_8000, &Ctc65::Poke_8001 );
|
|
}
|
|
|
|
regs[0] = 0;
|
|
regs[1] = 0;
|
|
|
|
UpdatePrg();
|
|
}
|
|
|
|
void Ctc65::SubLoad(State::Loader& state,const dword baseChunk)
|
|
{
|
|
NST_VERIFY( baseChunk == (AsciiId<'B','C','T'>::V) );
|
|
|
|
if (baseChunk == AsciiId<'B','C','T'>::V)
|
|
{
|
|
while (const dword chunk = state.Begin())
|
|
{
|
|
if (chunk == AsciiId<'R','E','G'>::V)
|
|
{
|
|
State::Loader::Data<2> data( state );
|
|
|
|
regs[0] = data[0];
|
|
regs[1] = data[1];
|
|
|
|
UpdatePrg();
|
|
}
|
|
|
|
state.End();
|
|
}
|
|
}
|
|
}
|
|
|
|
void Ctc65::SubSave(State::Saver& state) const
|
|
{
|
|
const byte data[2] = {regs[0],regs[1]};
|
|
state.Begin( AsciiId<'B','C','T'>::V ).Begin( AsciiId<'R','E','G'>::V ).Write( data ).End().End();
|
|
}
|
|
|
|
#ifdef NST_MSVC_OPTIMIZE
|
|
#pragma optimize("", on)
|
|
#endif
|
|
|
|
void Ctc65::UpdatePrg()
|
|
{
|
|
const uint chip = (regs[1] << 5 & 0x20) << (regs[0] >> 7);
|
|
openBus = chip < (regs[0] >> 7);
|
|
|
|
prg.SwapBanks<SIZE_16K,0x0000>
|
|
(
|
|
chip | (regs[0] & 0x1E) | (regs[0] >> 5 & regs[0]),
|
|
chip | (regs[0] & 0x1F) | (~regs[0] >> 5 & 0x01)
|
|
);
|
|
}
|
|
|
|
NES_POKE_D(Ctc65,8000)
|
|
{
|
|
if (regs[0] != data)
|
|
{
|
|
regs[0] = data;
|
|
UpdatePrg();
|
|
ppu.SetMirroring( (data & 0x40) ? Ppu::NMT_V : Ppu::NMT_H );
|
|
}
|
|
}
|
|
|
|
NES_POKE_D(Ctc65,8001)
|
|
{
|
|
if (regs[1] != data)
|
|
{
|
|
regs[1] = data;
|
|
UpdatePrg();
|
|
}
|
|
}
|
|
|
|
NES_PEEK_A(Ctc65,8000)
|
|
{
|
|
return !openBus ? prg.Peek( address - 0x8000 ) : (address >> 8);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|