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////////////////////////////////////////////////////////////////////////////////////////
//
// Nestopia - NES/Famicom emulator written in C++
//
// Copyright (C) 2025 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
//
////////////////////////////////////////////////////////////////////////////////////////
#include "NstBoard.hpp"
#include "NstBoardBmc60311c.hpp"
namespace Nes
{
namespace Core
{
namespace Boards
{
namespace Bmc
{
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("s", on)
#endif
void B60311c::SubReset(const bool hard)
{
Map( 0x6000U, &B60311c::Poke_6000 );
Map( 0x6001U, &B60311c::Poke_6001 );
Map( 0x8000U, 0xFFFFU, &B60311c::Poke_8000 );
regs[0] = 0;
regs[1] = 0;
latch = 0;
UpdatePrg();
}
void B60311c::SubLoad(State::Loader& state,const dword baseChunk)
{
NST_VERIFY( (baseChunk == AsciiId<'B','6','3'>::V) );
if (baseChunk == AsciiId<'B','6','3'>::V)
{
while (const dword chunk = state.Begin())
{
if (chunk == AsciiId<'R','E','G'>::V)
{
State::Loader::Data<3> data( state );
latch = data[0];
regs[0] = data[1];
regs[1] = data[2];
}
state.End();
}
UpdatePrg();
}
}
void B60311c::SubSave(State::Saver& state) const
{
const byte data[3] =
{
static_cast<byte>(latch),
static_cast<byte>(regs[0]),
static_cast<byte>(regs[1])
};
state.Begin( AsciiId<'B','6','3'>::V ).Begin( AsciiId<'R','E','G'>::V ).Write( data ).End().End();
}
void B60311c::UpdatePrg()
{
if (regs[0] & 0x02)
{
prg.SwapBank<SIZE_16K,0x0000>( (latch & 0x07) | (regs[1] & ~0x07) );
prg.SwapBank<SIZE_16K,0x4000>( 0x07 | (regs[1] & ~0x07) );
}
else if (regs[0] & 0x01)
{
prg.SwapBank<SIZE_32K,0x0000>( regs[1] >> 1 );
}
else
{
prg.SwapBank<SIZE_16K,0x0000>( regs[1] );
prg.SwapBank<SIZE_16K,0x4000>( regs[1] );
}
chr.Source().SetSecurity(true, regs[0] & 0x04 ? false : true);
ppu.SetMirroring( (regs[0] & 0x08) ? Ppu::NMT_H : Ppu::NMT_V );
}
#ifdef NST_MSVC_OPTIMIZE
#pragma optimize("", on)
#endif
NES_POKE_D(B60311c,6000)
{
regs[0] = data;
UpdatePrg();
}
NES_POKE_D(B60311c,6001)
{
regs[1] = data;
UpdatePrg();
}
NES_POKE_D(B60311c,8000)
{
latch = data;
UpdatePrg();
}
}
}
}
}
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