1 /* FCE Ultra - NES/Famicom Emulator
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3 * Copyright notice for this file:
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4 * Copyright (C) 2012 CaH4e3
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6 * This program is free software; you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation; either version 2 of the License, or
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9 * (at your option) any later version.
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11 * This program is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 * GNU General Public License for more details.
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program; if not, write to the Free Software
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18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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23 static uint8 cregs[4], pregs[2];
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24 static uint8 IRQCount, IRQa;
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26 static SFORMAT StateRegs[]=
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31 {&IRQCount, 1, "IRQC"},
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35 static void Sync(void)
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37 setprg8(0x8000,pregs[0]);
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38 setprg8(0xa000,pregs[1]);
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41 setchr2(0x0000,cregs[0]);
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42 setchr2(0x0800,cregs[1]);
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43 setchr2(0x1000,cregs[2]);
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44 setchr2(0x1800,cregs[3]);
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47 static DECLFW(M91Write0)
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53 static DECLFW(M91Write1)
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58 case 1: pregs[A & 1] = V; Sync(); break;
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59 case 2: IRQa = IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;
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60 case 3: IRQa = 1; X6502_IRQEnd(FCEU_IQEXT); break;
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64 static void M91Power(void)
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67 SetWriteHandler(0x6000,0x6fff,M91Write0);
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68 SetWriteHandler(0x7000,0x7fff,M91Write1);
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69 SetReadHandler(0x8000,0xffff,CartBR);
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72 static void M91IRQHook(void)
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74 if(IRQCount<8 && IRQa)
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79 X6502_IRQBegin(FCEU_IQEXT);
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84 static void StateRestore(int version)
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89 void Mapper91_Init(CartInfo *info)
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91 info->Power=M91Power;
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92 GameHBIRQHook=M91IRQHook;
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93 GameStateRestore=StateRestore;
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94 AddExState(&StateRegs, ~0, 0, 0);
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