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https://github.com/0ldsk00l/nestopia.git
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115 lines
2.5 KiB
C++
115 lines
2.5 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 "NstBoardCxRom.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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#ifdef NST_MSVC_OPTIMIZE
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#pragma optimize("s", on)
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#endif
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CnRom::Ce::Ce(const Context& c)
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: mask(0x0), state(0x0)
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{
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if (c.chr.Pin(26) == L"CE")
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{
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mask |= 0x1;
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state |= 0x1;
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}
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else if (c.chr.Pin(26) == L"/CE")
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{
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mask |= 0x1;
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state |= 0x0;
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}
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if (c.chr.Pin(27) == L"CE")
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{
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mask |= 0x2;
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state |= 0x2;
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}
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else if (c.chr.Pin(27) == L"/CE")
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{
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mask |= 0x2;
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state |= 0x0;
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}
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}
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CnRom::CnRom(const Context& c)
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: Board(c), ce(c) {}
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void CnRom::SubReset(bool)
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{
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if (ce.mask)
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{
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Map( 0x8000U, 0xFFFFU, &CnRom::Poke_8000 );
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}
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else if (board == Type::STD_CNROM)
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{
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Map( CHR_SWAP_8K_BC );
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}
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else
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{
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Map( 0x8000U, 0xFFFFU, CHR_SWAP_8K );
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}
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}
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void CpRom::SubReset(const bool hard)
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{
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Map( CHR_SWAP_4K_1_BC );
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if (hard)
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chr.SwapBank<SIZE_4K,0x1000>(0);
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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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NES_ACCESSOR(CnRom,ChrOpenBus)
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{
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return 0xFF;
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}
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NES_POKE_AD(CnRom,8000)
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{
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data = GetBusData(address,data);
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ppu.Update();
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chr.SwapBank<SIZE_8K,0x0000>( data & ~ce.mask );
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if ((data & ce.mask) == ce.state)
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chr.ResetAccessor();
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else
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chr.SetAccessor( this, &CnRom::Access_ChrOpenBus );
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}
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}
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}
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}
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