1 //////////////////////////////////////////////////////////////////////////////////////// 2 // 3 // Nestopia - NES/Famicom emulator written in C++ 4 // 5 // Copyright (C) 2003-2008 Martin Freij 6 // 7 // This file is part of Nestopia. 8 // 9 // Nestopia is free software; you can redistribute it and/or modify 10 // it under the terms of the GNU General Public License as published by 11 // the Free Software Foundation; either version 2 of the License, or 12 // (at your option) any later version. 13 // 14 // Nestopia is distributed in the hope that it will be useful, 15 // but WITHOUT ANY WARRANTY; without even the implied warranty of 16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 // GNU General Public License for more details. 18 // 19 // You should have received a copy of the GNU General Public License 20 // along with Nestopia; if not, write to the Free Software 21 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 22 // 23 //////////////////////////////////////////////////////////////////////////////////////// 24 25 #include "NstBoard.hpp" 26 #include "NstBoardBmcY2k64in1.hpp" 27 28 namespace Nes 29 { 30 namespace Core 31 { 32 namespace Boards 33 { 34 namespace Bmc 35 { 36 #ifdef NST_MSVC_OPTIMIZE 37 #pragma optimize("s", on) 38 #endif 39 SubReset(bool)40 void Y2k64in1::SubReset(bool) 41 { 42 Map( 0x5000U, 0x5003U, &Y2k64in1::Poke_5000 ); 43 Map( 0x8000U, 0xFFFFU, &Y2k64in1::Poke_8000 ); 44 45 regs[0] = 0x80; 46 regs[1] = 0x43; 47 regs[2] = 0x00; 48 regs[3] = 0x00; 49 50 Update(); 51 } 52 SubLoad(State::Loader & state,const dword baseChunk)53 void Y2k64in1::SubLoad(State::Loader& state,const dword baseChunk) 54 { 55 NST_VERIFY( baseChunk == (AsciiId<'B','Y','2'>::V) ); 56 57 if (baseChunk == AsciiId<'B','Y','2'>::V) 58 { 59 while (const dword chunk = state.Begin()) 60 { 61 if (chunk == AsciiId<'R','E','G'>::V) 62 state.Read( regs ); 63 64 state.End(); 65 } 66 } 67 } 68 SubSave(State::Saver & state) const69 void Y2k64in1::SubSave(State::Saver& state) const 70 { 71 state.Begin(AsciiId<'B','Y','2'>::V ).Begin( AsciiId<'R','E','G'>::V ).Write( regs ).End().End(); 72 } 73 74 #ifdef NST_MSVC_OPTIMIZE 75 #pragma optimize("", on) 76 #endif 77 Update()78 void Y2k64in1::Update() 79 { 80 uint bank = regs[1] & 0x1FU; 81 82 if (regs[0] & 0x80U & regs[1]) 83 { 84 prg.SwapBank<SIZE_32K,0x0000>( bank ); 85 } 86 else 87 { 88 bank = (bank << 1) | (regs[1] >> 6 & 0x1U); 89 prg.SwapBank<SIZE_16K,0x4000>( bank ); 90 91 if (regs[0] & 0x80U) 92 prg.SwapBank<SIZE_16K,0x0000>( bank ); 93 } 94 95 ppu.SetMirroring( (regs[0] & 0x20U) ? Ppu::NMT_H : Ppu::NMT_V ); 96 chr.SwapBank<SIZE_8K,0x0000>( (regs[2] << 2) | (regs[0] >> 1 & 0x3U) ); 97 } 98 99 NES_POKE_AD(Y2k64in1,5000) 100 { 101 regs[address & 0x3] = data; 102 Update(); 103 } 104 105 NES_POKE_D(Y2k64in1,8000) 106 { 107 regs[3] = data; 108 Update(); 109 } 110 } 111 } 112 } 113 } 114