| 1 | /* FCE Ultra - NES/Famicom Emulator\r |
| 2 | *\r |
| 3 | * Copyright notice for this file:\r |
| 4 | * Copyright (C) 2012 CaH4e3\r |
| 5 | *\r |
| 6 | * This program is free software; you can redistribute it and/or modify\r |
| 7 | * it under the terms of the GNU General Public License as published by\r |
| 8 | * the Free Software Foundation; either version 2 of the License, or\r |
| 9 | * (at your option) any later version.\r |
| 10 | *\r |
| 11 | * This program is distributed in the hope that it will be useful,\r |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of\r |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r |
| 14 | * GNU General Public License for more details.\r |
| 15 | *\r |
| 16 | * You should have received a copy of the GNU General Public License\r |
| 17 | * along with this program; if not, write to the Free Software\r |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA\r |
| 19 | */\r |
| 20 | \r |
| 21 | #include "mapinc.h"\r |
| 22 | \r |
| 23 | static uint8 cregs[4], pregs[2];\r |
| 24 | static uint8 IRQCount, IRQa;\r |
| 25 | \r |
| 26 | static SFORMAT StateRegs[]=\r |
| 27 | {\r |
| 28 | {cregs, 4, "CREG"},\r |
| 29 | {pregs, 2, "PREG"},\r |
| 30 | {&IRQa, 1, "IRQA"},\r |
| 31 | {&IRQCount, 1, "IRQC"},\r |
| 32 | {0}\r |
| 33 | };\r |
| 34 | \r |
| 35 | static void Sync(void)\r |
| 36 | {\r |
| 37 | setprg8(0x8000,pregs[0]);\r |
| 38 | setprg8(0xa000,pregs[1]);\r |
| 39 | setprg8(0xc000,~1);\r |
| 40 | setprg8(0xe000,~0);\r |
| 41 | setchr2(0x0000,cregs[0]);\r |
| 42 | setchr2(0x0800,cregs[1]);\r |
| 43 | setchr2(0x1000,cregs[2]);\r |
| 44 | setchr2(0x1800,cregs[3]);\r |
| 45 | }\r |
| 46 | \r |
| 47 | static DECLFW(M91Write0)\r |
| 48 | {\r |
| 49 | cregs[A & 3] = V;\r |
| 50 | Sync();\r |
| 51 | }\r |
| 52 | \r |
| 53 | static DECLFW(M91Write1)\r |
| 54 | {\r |
| 55 | switch (A & 3)\r |
| 56 | {\r |
| 57 | case 0:\r |
| 58 | case 1: pregs[A & 1] = V; Sync(); break;\r |
| 59 | case 2: IRQa = IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;\r |
| 60 | case 3: IRQa = 1; X6502_IRQEnd(FCEU_IQEXT); break;\r |
| 61 | }\r |
| 62 | }\r |
| 63 | \r |
| 64 | static void M91Power(void)\r |
| 65 | {\r |
| 66 | Sync();\r |
| 67 | SetWriteHandler(0x6000,0x6fff,M91Write0);\r |
| 68 | SetWriteHandler(0x7000,0x7fff,M91Write1);\r |
| 69 | SetReadHandler(0x8000,0xffff,CartBR);\r |
| 70 | }\r |
| 71 | \r |
| 72 | static void M91IRQHook(void)\r |
| 73 | {\r |
| 74 | if(IRQCount<8 && IRQa)\r |
| 75 | {\r |
| 76 | IRQCount++;\r |
| 77 | if(IRQCount>=8)\r |
| 78 | {\r |
| 79 | X6502_IRQBegin(FCEU_IQEXT); \r |
| 80 | } \r |
| 81 | }\r |
| 82 | }\r |
| 83 | \r |
| 84 | static void StateRestore(int version)\r |
| 85 | {\r |
| 86 | Sync();\r |
| 87 | }\r |
| 88 | \r |
| 89 | void Mapper91_Init(CartInfo *info)\r |
| 90 | {\r |
| 91 | info->Power=M91Power;\r |
| 92 | GameHBIRQHook=M91IRQHook;\r |
| 93 | GameStateRestore=StateRestore;\r |
| 94 | AddExState(&StateRegs, ~0, 0, 0);\r |
| 95 | }\r |