| 1 | /* FCE Ultra - NES/Famicom Emulator |
| 2 | * |
| 3 | * Copyright notice for this file: |
| 4 | * Copyright (C) 2005 CaH4e3 |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | * |
| 20 | * Gimmick Bootleg |
| 21 | */ |
| 22 | |
| 23 | #include "mapinc.h" |
| 24 | |
| 25 | static uint8 prg[4]; |
| 26 | static uint8 chr[8]; |
| 27 | static uint8 IRQCount; |
| 28 | static uint8 IRQPre; |
| 29 | static uint8 IRQa; |
| 30 | |
| 31 | static SFORMAT StateRegs[]= |
| 32 | { |
| 33 | {prg, 4, "PRG"}, |
| 34 | {chr, 8, "CHR"}, |
| 35 | {&IRQCount, 1, "IRQCOUNT"}, |
| 36 | {&IRQPre, 1, "IRQPRE"}, |
| 37 | {&IRQa, 1, "IRQA"}, |
| 38 | {0} |
| 39 | }; |
| 40 | |
| 41 | static void SyncPrg(void) |
| 42 | { |
| 43 | setprg8(0x6000,0); |
| 44 | setprg8(0x8000,prg[0]); |
| 45 | setprg8(0xA000,prg[1]); |
| 46 | setprg8(0xC000,prg[2]); |
| 47 | setprg8(0xE000,~0); |
| 48 | } |
| 49 | |
| 50 | static void SyncChr(void) |
| 51 | { |
| 52 | int i; |
| 53 | for(i=0; i<8; i++) |
| 54 | setchr1(i<<10,chr[i]); |
| 55 | } |
| 56 | |
| 57 | static void StateRestore(int version) |
| 58 | { |
| 59 | SyncPrg(); |
| 60 | SyncChr(); |
| 61 | } |
| 62 | |
| 63 | static DECLFW(M183Write) |
| 64 | { |
| 65 | if(((A&0xF80C)>=0xB000)&&((A&0xF80C)<=0xE00C)) |
| 66 | { |
| 67 | uint8 index=(((A&0x7000)>>11)-6)|((A&8)>>3); |
| 68 | chr[index]=(chr[index]&(0xF0>>(A&4)))|((V&0x0F)<<(A&4)); |
| 69 | SyncChr(); |
| 70 | } |
| 71 | else switch (A&0xF80C) |
| 72 | { |
| 73 | case 0x8800: prg[0]=V; SyncPrg(); break; |
| 74 | case 0xA800: prg[1]=V; SyncPrg(); break; |
| 75 | case 0xA000: prg[2]=V; SyncPrg(); break; |
| 76 | case 0x9800: switch (V&3) |
| 77 | { |
| 78 | case 0: setmirror(MI_V); break; |
| 79 | case 1: setmirror(MI_H); break; |
| 80 | case 2: setmirror(MI_0); break; |
| 81 | case 3: setmirror(MI_1); break; |
| 82 | } |
| 83 | break; |
| 84 | case 0xF000: IRQCount=((IRQCount&0xF0)|(V&0xF)); break; |
| 85 | case 0xF004: IRQCount=((IRQCount&0x0F)|((V&0xF)<<4)); break; |
| 86 | case 0xF008: IRQa=V; if(!V)IRQPre=0; X6502_IRQEnd(FCEU_IQEXT); break; |
| 87 | case 0xF00C: IRQPre=16; break; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | static void M183IRQCounter(void) |
| 92 | { |
| 93 | if(IRQa) |
| 94 | { |
| 95 | IRQCount++; |
| 96 | if((IRQCount-IRQPre)==238) |
| 97 | X6502_IRQBegin(FCEU_IQEXT); |
| 98 | } |
| 99 | } |
| 100 | |
| 101 | static void M183Power(void) |
| 102 | { |
| 103 | IRQPre=IRQCount=IRQa=0; |
| 104 | SetReadHandler(0x8000,0xFFFF,CartBR); |
| 105 | SetWriteHandler(0x8000,0xFFFF,M183Write); |
| 106 | SetReadHandler(0x6000,0x7FFF,CartBR); |
| 107 | SyncPrg(); |
| 108 | SyncChr(); |
| 109 | } |
| 110 | |
| 111 | void Mapper183_Init(CartInfo *info) |
| 112 | { |
| 113 | info->Power=M183Power; |
| 114 | GameHBIRQHook=M183IRQCounter; |
| 115 | GameStateRestore=StateRestore; |
| 116 | AddExState(&StateRegs, ~0, 0, 0); |
| 117 | } |