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////////////////////////////////////////////////////////////////////////////////////////
//
// Nestopia - NES/Famicom emulator written in C++
//
// Copyright (C) 2003-2008 Martin Freij
// Copyright (C) 2020-2022 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
//
////////////////////////////////////////////////////////////////////////////////////////
/* Note: At the time this was written, MMC3 boards with larger than 512K PRG
are fantasy hardware. This may change in the future if it is implemented in
a product along the lines of the PowerPak or Everdrive.
*/
#include "NstBoard.hpp"
#include "NstBoardMmc3.hpp"
#include "NstBoardUnlMmc3BigPrgRom.hpp"
#include "../NstFile.hpp"
namespace Nes
{
namespace Core
{
namespace Boards
{
namespace Unlicensed
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
void Mmc3BigPrgRom::SubReset(const bool hard)
{
Mmc3::SubReset( hard );
for (uint i=0x0000; i < 0x2000; i += 0x2)
{
Map( 0x8001 + i, &Mmc3BigPrgRom::Poke_8001 );
}
}
void Mmc3BigPrgRom::SubLoad(State::Loader& state,const dword baseChunk)
{
NST_VERIFY( baseChunk == (AsciiId<'M','M','3'>::V) );
if (baseChunk == AsciiId<'M','M','3'>::V)
{
while (const dword chunk = state.Begin())
{
switch (chunk)
{
case AsciiId<'R','E','G'>::V:
{
State::Loader::Data<12> data( state );
regs.ctrl0 = data[0];
regs.ctrl1 = data[1];
banks.prg[0] = data[2] & 0x7FU;
banks.prg[1] = data[3] & 0x7FU;
banks.chr[0] = (data[6] & 0x7FU) << 1;
banks.chr[1] = banks.chr[0] | 0x01U;
banks.chr[2] = (data[7] & 0x7FU) << 1;
banks.chr[3] = banks.chr[2] | 0x01U;
banks.chr[4] = data[8];
banks.chr[5] = data[9];
banks.chr[6] = data[10];
banks.chr[7] = data[11];
break;
}
case AsciiId<'I','R','Q'>::V:
irq.unit.LoadState( state );
break;
}
state.End();
}
}
}
void Mmc3BigPrgRom::SubSave(State::Saver& state) const
{
state.Begin( AsciiId<'M','M','3'>::V );
const byte data[12] =
{
regs.ctrl0,
regs.ctrl1,
banks.prg[0],
banks.prg[1],
0x7E,
0x7F,
banks.chr[0] >> 1,
banks.chr[2] >> 1,
banks.chr[4],
banks.chr[5],
banks.chr[6],
banks.chr[7]
};
state.Begin( AsciiId<'R','E','G'>::V ).Write( data ).End();
irq.unit.SaveState( state, AsciiId<'I','R','Q'>::V );
state.End();
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
NES_POKE_D(Mmc3BigPrgRom,8001)
{
uint address = regs.ctrl0 & 0x7;
if (address < 6)
{
ppu.Update();
uint base = regs.ctrl0 << 5 & 0x1000;
if (address < 2)
{
address <<= 1;
base |= address << 10;
UpdateChr( base | 0x0000, (banks.chr[address+0] = data & 0xFE) );
UpdateChr( base | 0x0400, (banks.chr[address+1] = data | 0x01) );
}
else
{
UpdateChr( (base ^ 0x1000) | (address-2) << 10, (banks.chr[address+2] = data) );
}
}
else
{
UpdatePrg( (address == 6) ? (regs.ctrl0 << 8 & 0x4000) : 0x2000, (banks.prg[address-6] = data & 0x7F) );
}
}
}
}
}
}
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