| 1 | /* FCE Ultra - NES/Famicom Emulator |
| 2 | * |
| 3 | * Copyright notice for this file: |
| 4 | * Copyright (C) 2002 Xodnizel |
| 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 uint8 cmd; |
| 24 | static uint8 DRegs[8]; |
| 25 | |
| 26 | static SFORMAT DEI_StateRegs[]= |
| 27 | { |
| 28 | {&cmd, 1, "CMD"}, |
| 29 | {DRegs, 8, "DREG"}, |
| 30 | {0} |
| 31 | }; |
| 32 | |
| 33 | static void Sync(void) |
| 34 | { |
| 35 | setchr2(0x0000,DRegs[0]); |
| 36 | setchr2(0x0800,DRegs[1]); |
| 37 | int x; |
| 38 | for(x=0;x<4;x++) |
| 39 | setchr1(0x1000+(x<<10),DRegs[2+x]); |
| 40 | setprg8(0x8000,DRegs[6]); |
| 41 | setprg8(0xa000,DRegs[7]); |
| 42 | } |
| 43 | |
| 44 | static void StateRestore(int version) |
| 45 | { |
| 46 | Sync(); |
| 47 | } |
| 48 | |
| 49 | static DECLFW(DEIWrite) |
| 50 | { |
| 51 | switch(A&0x8001) |
| 52 | { |
| 53 | case 0x8000: cmd=V&0x07; break; |
| 54 | case 0x8001: if(cmd<=0x05) |
| 55 | V&=0x3F; |
| 56 | else |
| 57 | V&=0x0F; |
| 58 | if(cmd<=0x01) V>>=1; |
| 59 | DRegs[cmd&0x07]=V; |
| 60 | Sync(); |
| 61 | break; |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | static void DEIPower(void) |
| 66 | { |
| 67 | setprg8(0xc000,0xE); |
| 68 | setprg8(0xe000,0xF); |
| 69 | cmd=0; |
| 70 | memset(DRegs,0,8); |
| 71 | Sync(); |
| 72 | SetReadHandler(0x8000,0xFFFF,CartBR); |
| 73 | SetWriteHandler(0x8000,0xFFFF,DEIWrite); |
| 74 | } |
| 75 | |
| 76 | |
| 77 | void DEIROM_Init(CartInfo *info) |
| 78 | { |
| 79 | info->Power=DEIPower; |
| 80 | GameStateRestore=StateRestore; |
| 81 | AddExState(&DEI_StateRegs, ~0, 0, 0); |
| 82 | } |