mirror of
https://github.com/0ldsk00l/nestopia.git
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132 lines
3.4 KiB
C++
132 lines
3.4 KiB
C++
////////////////////////////////////////////////////////////////////////////////////////
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//
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// Nestopia - NES/Famicom emulator written in C++
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//
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// Copyright (C) 2003-2008 Martin Freij
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//
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// This file is part of Nestopia.
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//
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// Nestopia is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// Nestopia is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Nestopia; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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////////////////////////////////////////////////////////////////////////////////////////
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#include "NstBoard.hpp"
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#include "NstBoardBmcSuperVision16in1.hpp"
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#include "../NstCrc32.hpp"
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namespace Nes
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{
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namespace Core
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{
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namespace Boards
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{
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namespace Bmc
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{
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#ifdef NST_MSVC_OPTIMIZE
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#pragma optimize("s", on)
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#endif
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SuperVision16in1::SuperVision16in1(const Context& c)
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:
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Board (c),
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epromFirst (c.prg.Size() >= SIZE_32K && Crc32::Compute(c.prg.Mem(),SIZE_32K) == EPROM_CRC)
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{
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}
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void SuperVision16in1::SubReset(const bool hard)
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{
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if (hard)
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{
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regs[0] = 0;
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regs[1] = 0;
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UpdatePrg();
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}
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Map( 0x6000U, 0x7FFFU, &SuperVision16in1::Peek_6000, &SuperVision16in1::Poke_6000 );
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Map( 0x8000U, 0xFFFFU, &SuperVision16in1::Poke_8000 );
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}
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void SuperVision16in1::SubLoad(State::Loader& state,const dword baseChunk)
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{
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NST_VERIFY( baseChunk == (AsciiId<'B','S','V'>::V) );
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if (baseChunk == AsciiId<'B','S','V'>::V)
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{
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while (const dword chunk = state.Begin())
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{
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if (chunk == AsciiId<'R','E','G'>::V)
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{
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{
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State::Loader::Data<2> data( state );
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regs[0] = data[0];
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regs[1] = data[1];
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}
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UpdatePrg();
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}
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state.End();
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}
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}
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}
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void SuperVision16in1::SubSave(State::Saver& state) const
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{
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state.Begin( AsciiId<'B','S','V'>::V ).Begin( AsciiId<'R','E','G'>::V ).Write16( regs[0] | uint(regs[1]) << 8 ).End().End();
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}
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#ifdef NST_MSVC_OPTIMIZE
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#pragma optimize("", on)
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#endif
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void SuperVision16in1::UpdatePrg()
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{
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const uint r = regs[0] << 3 & 0x78;
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wrk.SwapBank<SIZE_8K,0x0000>
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(
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(r << 1 | 0xF) + (epromFirst ? 0x4 : 0x0)
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);
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prg.SwapBanks<SIZE_16K,0x0000>
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(
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(regs[0] & 0x10) ? (r | (regs[1] & 0x7)) + (epromFirst ? 0x2 : 0x0) : epromFirst ? 0x00 : 0x80,
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(regs[0] & 0x10) ? (r | (0xFF & 0x7)) + (epromFirst ? 0x2 : 0x0) : epromFirst ? 0x01 : 0x81
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);
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}
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NES_PEEK_A(SuperVision16in1,6000)
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{
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return wrk[0][address - 0x6000];
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}
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NES_POKE_D(SuperVision16in1,6000)
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{
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regs[0] = data;
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UpdatePrg();
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ppu.SetMirroring( (data & 0x20) ? Ppu::NMT_H : Ppu::NMT_V );
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}
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NES_POKE_D(SuperVision16in1,8000)
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{
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regs[1] = data;
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UpdatePrg();
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}
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}
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}
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}
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}
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