| 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 | * (VRC4 mapper)\r |
| 21 | *\r |
| 22 | */\r |
| 23 | \r |
| 24 | #include "mapinc.h"\r |
| 25 | \r |
| 26 | static uint8 IRQCount;//, IRQPre;\r |
| 27 | static uint8 IRQa;\r |
| 28 | static uint8 prg_reg[2];\r |
| 29 | static uint8 chr_reg[8];\r |
| 30 | static uint8 mirr;\r |
| 31 | \r |
| 32 | static SFORMAT StateRegs[]=\r |
| 33 | {\r |
| 34 | {&IRQCount, 1, "IRQC"},\r |
| 35 | {&IRQa, 1, "IRQA"},\r |
| 36 | {prg_reg, 2, "PRG"},\r |
| 37 | {chr_reg, 8, "CHR"},\r |
| 38 | {&mirr, 1, "MIRR"},\r |
| 39 | {0}\r |
| 40 | };\r |
| 41 | \r |
| 42 | static void M222IRQ(void)\r |
| 43 | {\r |
| 44 | if(IRQa)\r |
| 45 | {\r |
| 46 | IRQCount++;\r |
| 47 | if(IRQCount>=238)\r |
| 48 | {\r |
| 49 | X6502_IRQBegin(FCEU_IQEXT);\r |
| 50 | // IRQa=0;\r |
| 51 | }\r |
| 52 | }\r |
| 53 | }\r |
| 54 | \r |
| 55 | static void Sync(void)\r |
| 56 | {\r |
| 57 | setprg8(0x8000,prg_reg[0]);\r |
| 58 | setprg8(0xA000,prg_reg[1]);\r |
| 59 | int i;\r |
| 60 | for(i=0; i<8; i++)\r |
| 61 | setchr1(i<<10,chr_reg[i]); \r |
| 62 | setmirror(mirr^1); \r |
| 63 | }\r |
| 64 | \r |
| 65 | static DECLFW(M222Write)\r |
| 66 | {\r |
| 67 | switch(A&0xF003)\r |
| 68 | {\r |
| 69 | case 0x8000: prg_reg[0]=V; break;\r |
| 70 | case 0x9000: mirr=V&1; break;\r |
| 71 | case 0xA000: prg_reg[1]=V; break;\r |
| 72 | case 0xB000: chr_reg[0]=V; break;\r |
| 73 | case 0xB002: chr_reg[1]=V; break;\r |
| 74 | case 0xC000: chr_reg[2]=V; break;\r |
| 75 | case 0xC002: chr_reg[3]=V; break;\r |
| 76 | case 0xD000: chr_reg[4]=V; break;\r |
| 77 | case 0xD002: chr_reg[5]=V; break;\r |
| 78 | case 0xE000: chr_reg[6]=V; break;\r |
| 79 | case 0xE002: chr_reg[7]=V; break;\r |
| 80 | // case 0xF000: FCEU_printf("%04x:%02x %d\n",A,V,scanline); IRQa=V; if(!V)IRQPre=0; X6502_IRQEnd(FCEU_IQEXT); break;\r |
| 81 | // / case 0xF001: FCEU_printf("%04x:%02x %d\n",A,V,scanline); IRQCount=V; break;\r |
| 82 | // case 0xF002: FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;\r |
| 83 | // case 0xD001: IRQa=V; X6502_IRQEnd(FCEU_IQEXT); FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;\r |
| 84 | // case 0xC001: IRQPre=16; FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;\r |
| 85 | case 0xF000: IRQa=IRQCount=V; if(scanline<240) IRQCount-=8; else IRQCount+=4; X6502_IRQEnd(FCEU_IQEXT); break;\r |
| 86 | }\r |
| 87 | Sync();\r |
| 88 | }\r |
| 89 | \r |
| 90 | static void M222Power(void)\r |
| 91 | {\r |
| 92 | setprg16(0xC000,~0);\r |
| 93 | SetReadHandler(0x8000,0xFFFF,CartBR);\r |
| 94 | SetWriteHandler(0x8000,0xFFFF,M222Write);\r |
| 95 | }\r |
| 96 | \r |
| 97 | static void StateRestore(int version)\r |
| 98 | {\r |
| 99 | Sync();\r |
| 100 | }\r |
| 101 | \r |
| 102 | void Mapper222_Init(CartInfo *info)\r |
| 103 | {\r |
| 104 | info->Power=M222Power;\r |
| 105 | GameHBIRQHook=M222IRQ;\r |
| 106 | GameStateRestore=StateRestore;\r |
| 107 | AddExState(&StateRegs, ~0, 0, 0);\r |
| 108 | }\r |