merge mapper code from FCEUX
[fceu.git] / mappers / 76.c
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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
19  */
20
21 #include "mapinc.h"
22 static uint8 MMC3_cmd;
23
24 static DECLFW(Mapper76_write)
25 {
26         switch(A&0xE001){
27         case 0x8000:
28          MMC3_cmd = V;
29          break;
30         case 0x8001:
31                 switch(MMC3_cmd&0x07){
32                 case 2: VROM_BANK2(0x000,V);break;
33                 case 3: VROM_BANK2(0x800,V);break;
34                 case 4: VROM_BANK2(0x1000,V);break;
35                 case 5: VROM_BANK2(0x1800,V);break;
36                 case 6:
37                         if(MMC3_cmd&0x40) ROM_BANK8(0xC000,V);
38                         else ROM_BANK8(0x8000,V);
39                         break;
40                 case 7: ROM_BANK8(0xA000,V);
41                         break;
42                }
43                break;
44         case 0xA000:
45         MIRROR_SET(V&1);
46         break;
47  }
48 }
49
50 void Mapper76_init(void)
51 {
52 SetWriteHandler(0x8000,0xffff,Mapper76_write);
53 }
54