| 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 | |
| 22 | #include "mapinc.h" |
| 23 | |
| 24 | static uint8 prg_reg; |
| 25 | static uint8 chr_reg; |
| 26 | static uint8 hrd_flag; |
| 27 | |
| 28 | static SFORMAT StateRegs[]= |
| 29 | { |
| 30 | {&prg_reg, 1, "PRG"}, |
| 31 | {&chr_reg, 1, "CHR"}, |
| 32 | {0} |
| 33 | }; |
| 34 | |
| 35 | static void Sync(void) |
| 36 | { |
| 37 | if(prg_reg&0x80) |
| 38 | setprg32(0x8000,prg_reg>>6); |
| 39 | else |
| 40 | { |
| 41 | setprg16(0x8000,(prg_reg>>5)&3); |
| 42 | setprg16(0xC000,(prg_reg>>5)&3); |
| 43 | } |
| 44 | setmirror((prg_reg&8)>>3); |
| 45 | setchr8((chr_reg&3)|(prg_reg&7)|((prg_reg&0x10)>>1)); |
| 46 | } |
| 47 | |
| 48 | static DECLFR(M57Read) |
| 49 | { |
| 50 | return hrd_flag; |
| 51 | } |
| 52 | |
| 53 | static DECLFW(M57Write) |
| 54 | { |
| 55 | if((A&0x8800)==0x8800) |
| 56 | prg_reg=V; |
| 57 | else |
| 58 | chr_reg=V; |
| 59 | Sync(); |
| 60 | } |
| 61 | |
| 62 | static void M57Power(void) |
| 63 | { |
| 64 | prg_reg=0; |
| 65 | chr_reg=0; |
| 66 | hrd_flag=0; |
| 67 | SetReadHandler(0x8000,0xFFFF,CartBR); |
| 68 | SetWriteHandler(0x8000,0xFFFF,M57Write); |
| 69 | SetReadHandler(0x6000,0x6000,M57Read); |
| 70 | Sync(); |
| 71 | } |
| 72 | |
| 73 | static void M57Reset() |
| 74 | { |
| 75 | if(hrd_flag==3) |
| 76 | hrd_flag=0; |
| 77 | else |
| 78 | hrd_flag++; |
| 79 | FCEU_printf("Select Register = %02x\n",hrd_flag); |
| 80 | } |
| 81 | |
| 82 | static void StateRestore(int version) |
| 83 | { |
| 84 | Sync(); |
| 85 | } |
| 86 | |
| 87 | void Mapper57_Init(CartInfo *info) |
| 88 | { |
| 89 | info->Power=M57Power; |
| 90 | info->Reset=M57Reset; |
| 91 | GameStateRestore=StateRestore; |
| 92 | AddExState(&StateRegs, ~0, 0, 0); |
| 93 | } |