//////////////////////////////////////////////////////////////////////////////////////// // // 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 "NstBoardCxRom.hpp" namespace Nes { namespace Core { namespace Boards { #ifdef NST_MSVC_OPTIMIZE #pragma optimize("s", on) #endif CnRom::Ce::Ce(const Context& c) : mask(0x0), state(0x0) { if (c.chr.Pin(26) == L"CE") { mask |= 0x1; state |= 0x1; } else if (c.chr.Pin(26) == L"/CE") { mask |= 0x1; state |= 0x0; } if (c.chr.Pin(27) == L"CE") { mask |= 0x2; state |= 0x2; } else if (c.chr.Pin(27) == L"/CE") { mask |= 0x2; state |= 0x0; } } CnRom::CnRom(const Context& c) : Board(c), ce(c) {} void CnRom::SubReset(bool) { if (ce.mask) { Map( 0x8000U, 0xFFFFU, &CnRom::Poke_8000 ); } else if (board == Type::STD_CNROM) { Map( CHR_SWAP_8K_BC ); } else { Map( 0x8000U, 0xFFFFU, CHR_SWAP_8K ); } } void CpRom::SubReset(const bool hard) { Map( CHR_SWAP_4K_1_BC ); if (hard) chr.SwapBank(0); } #ifdef NST_MSVC_OPTIMIZE #pragma optimize("", on) #endif NES_ACCESSOR(CnRom,ChrOpenBus) { return 0xFF; } NES_POKE_AD(CnRom,8000) { data = GetBusData(address,data); ppu.Update(); chr.SwapBank( data & ~ce.mask ); if ((data & ce.mask) == ce.state) chr.ResetAccessor(); else chr.SetAccessor( this, &CnRom::Access_ChrOpenBus ); } } } }