| 1 | /* FCE Ultra - NES/Famicom Emulator\r |
| 2 | *\r |
| 3 | * Copyright notice for this file:\r |
| 4 | * Copyright (C) 2005 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 | * Lethal Weapon (VRC4 mapper)\r |
| 21 | */\r |
| 22 | \r |
| 23 | #include "mapinc.h"\r |
| 24 | \r |
| 25 | static uint8 prg0, prg1, mirr, swap;\r |
| 26 | static uint8 chr[8];\r |
| 27 | static uint8 IRQCount; \r |
| 28 | static uint8 IRQPre;\r |
| 29 | static uint8 IRQa;\r |
| 30 | \r |
| 31 | static SFORMAT StateRegs[]=\r |
| 32 | {\r |
| 33 | {&prg0, 1, "PRG0"},\r |
| 34 | {&prg0, 1, "PRG1"},\r |
| 35 | {&mirr, 1, "MIRR"},\r |
| 36 | {&swap, 1, "SWAP"},\r |
| 37 | {chr, 8, "CHR"},\r |
| 38 | {&IRQCount, 1, "IRQC"},\r |
| 39 | {&IRQPre, 1, "IRQP"},\r |
| 40 | {&IRQa, 1, "IRQA"},\r |
| 41 | {0}\r |
| 42 | };\r |
| 43 | \r |
| 44 | static void SyncPrg(void)\r |
| 45 | {\r |
| 46 | if(swap&3)\r |
| 47 | {\r |
| 48 | setprg8(0x8000,~1);\r |
| 49 | setprg8(0xC000,prg0);\r |
| 50 | } \r |
| 51 | else\r |
| 52 | {\r |
| 53 | setprg8(0x8000,prg0);\r |
| 54 | setprg8(0xC000,~1);\r |
| 55 | }\r |
| 56 | setprg8(0xA000,prg1);\r |
| 57 | setprg8(0xE000,~0);\r |
| 58 | }\r |
| 59 | \r |
| 60 | static void SyncChr(void)\r |
| 61 | {\r |
| 62 | int i;\r |
| 63 | for(i=0; i<8; i++)\r |
| 64 | setchr1(i<<10,chr[i]);\r |
| 65 | setmirror(mirr^1);\r |
| 66 | }\r |
| 67 | \r |
| 68 | static void StateRestore(int version)\r |
| 69 | {\r |
| 70 | SyncPrg();\r |
| 71 | SyncChr();\r |
| 72 | }\r |
| 73 | \r |
| 74 | static DECLFW(UNLTF1201Write)\r |
| 75 | {\r |
| 76 | A=(A&0xF003)|((A&0xC)>>2);\r |
| 77 | if((A>=0xB000)&&(A<=0xE003))\r |
| 78 | {\r |
| 79 | int ind=(((A>>11)-6)|(A&1))&7;\r |
| 80 | int sar=((A&2)<<1);\r |
| 81 | chr[ind]=(chr[ind]&(0xF0>>sar))|((V&0x0F)<<sar);\r |
| 82 | SyncChr();\r |
| 83 | }\r |
| 84 | else switch (A&0xF003)\r |
| 85 | {\r |
| 86 | case 0x8000: prg0=V; SyncPrg(); break;\r |
| 87 | case 0xA000: prg1=V; SyncPrg(); break;\r |
| 88 | case 0x9000: mirr=V&1; SyncChr(); break;\r |
| 89 | case 0x9001: swap=V&3; SyncPrg(); break;\r |
| 90 | case 0xF000: IRQCount=((IRQCount&0xF0)|(V&0xF)); break;\r |
| 91 | case 0xF002: IRQCount=((IRQCount&0x0F)|((V&0xF)<<4)); break;\r |
| 92 | case 0xF001: \r |
| 93 | case 0xF003: IRQa=V&2; X6502_IRQEnd(FCEU_IQEXT); if(scanline<240) IRQCount-=8; break;\r |
| 94 | }\r |
| 95 | }\r |
| 96 | \r |
| 97 | static void UNLTF1201IRQCounter(void)\r |
| 98 | {\r |
| 99 | if(IRQa)\r |
| 100 | {\r |
| 101 | IRQCount++;\r |
| 102 | if(IRQCount==237)\r |
| 103 | {\r |
| 104 | X6502_IRQBegin(FCEU_IQEXT);\r |
| 105 | }\r |
| 106 | }\r |
| 107 | }\r |
| 108 | \r |
| 109 | static void UNLTF1201Power(void)\r |
| 110 | {\r |
| 111 | IRQPre=IRQCount=IRQa=0;\r |
| 112 | SetReadHandler(0x8000,0xFFFF,CartBR);\r |
| 113 | SetWriteHandler(0x8000,0xFFFF,UNLTF1201Write);\r |
| 114 | SyncPrg();\r |
| 115 | SyncChr();\r |
| 116 | }\r |
| 117 | \r |
| 118 | void UNLTF1201_Init(CartInfo *info)\r |
| 119 | {\r |
| 120 | info->Power=UNLTF1201Power;\r |
| 121 | GameHBIRQHook=UNLTF1201IRQCounter;\r |
| 122 | GameStateRestore=StateRestore;\r |
| 123 | AddExState(&StateRegs, ~0, 0, 0);\r |
| 124 | }\r |