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