| 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\r |
| 19 | */\r |
| 20 | \r |
| 21 | #include "mapinc.h"\r |
| 22 | \r |
| 23 | static uint16 cmdreg;\r |
| 24 | static uint8 invalid_data;\r |
| 25 | static SFORMAT StateRegs[]=\r |
| 26 | {\r |
| 27 | {&invalid_data, 1, "INVD"}, \r |
| 28 | {&cmdreg, 2, "CMDREG"},\r |
| 29 | {0}\r |
| 30 | };\r |
| 31 | \r |
| 32 | static void Sync(void)\r |
| 33 | {\r |
| 34 | setprg16r((cmdreg&0x060)>>5,0x8000,(cmdreg&0x01C)>>2);\r |
| 35 | setprg16r((cmdreg&0x060)>>5,0xC000,(cmdreg&0x200)?(~0):0);\r |
| 36 | setmirror(((cmdreg&2)>>1)^1);\r |
| 37 | }\r |
| 38 | \r |
| 39 | static DECLFR(UNL8157Read)\r |
| 40 | {\r |
| 41 | if(invalid_data&&cmdreg&0x100)\r |
| 42 | return 0xFF;\r |
| 43 | else\r |
| 44 | return CartBR(A);\r |
| 45 | }\r |
| 46 | \r |
| 47 | static DECLFW(UNL8157Write)\r |
| 48 | {\r |
| 49 | cmdreg=A;\r |
| 50 | Sync();\r |
| 51 | }\r |
| 52 | \r |
| 53 | static void UNL8157Power(void)\r |
| 54 | {\r |
| 55 | setchr8(0);\r |
| 56 | SetWriteHandler(0x8000,0xFFFF,UNL8157Write);\r |
| 57 | SetReadHandler(0x8000,0xFFFF,UNL8157Read);\r |
| 58 | cmdreg=0x200;\r |
| 59 | invalid_data=1;\r |
| 60 | Sync();\r |
| 61 | }\r |
| 62 | \r |
| 63 | static void UNL8157Reset(void)\r |
| 64 | {\r |
| 65 | cmdreg=0;\r |
| 66 | invalid_data^=1;\r |
| 67 | Sync();\r |
| 68 | }\r |
| 69 | \r |
| 70 | static void UNL8157Restore(int version)\r |
| 71 | {\r |
| 72 | Sync();\r |
| 73 | }\r |
| 74 | \r |
| 75 | void UNL8157_Init(CartInfo *info)\r |
| 76 | {\r |
| 77 | info->Power=UNL8157Power;\r |
| 78 | info->Reset=UNL8157Reset;\r |
| 79 | GameStateRestore=UNL8157Restore;\r |
| 80 | AddExState(&StateRegs, ~0, 0, 0);\r |
| 81 | }\r |