c62d2810 |
1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 2002 Ben Parnell |
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 | #define mode mapbyte1[0] |
24 | #define page mapbyte1[1] |
25 | |
26 | static uint32 Get8K(uint32 A) |
27 | { |
28 | uint32 bank; |
29 | |
30 | bank=(page<<2)|((A>>13)&1); |
31 | |
32 | if(A&0x4000 && !(mode&1)) bank|=0xC; |
33 | if(!(A&0x8000)) bank|=0x20; |
34 | if(mode==2) bank|=2; |
35 | else bank|=(A>>13)&2; |
36 | return(bank); |
37 | } |
38 | |
39 | static void Synco(void) |
40 | { |
41 | uint32 x; |
42 | if(mapbyte1[0]<=2) |
43 | MIRROR_SET2(1); |
44 | else |
45 | MIRROR_SET2(0); |
46 | for(x=0x6000;x<0x10000;x+=8192) |
47 | ROM_BANK8(x,Get8K(x)); |
48 | } |
49 | |
50 | static DECLFW(Write) |
51 | { |
52 | if(A&0x8000) mapbyte1[1]=V&0xF; |
53 | else mapbyte1[0]=(mapbyte1[0]&2)|((V>>1)&1); |
54 | |
55 | if(A&0x4000) mapbyte1[0]=(mapbyte1[0]&1)|((V>>3)&2); |
56 | Synco(); |
57 | } |
58 | |
59 | void Mapper51_init(void) |
60 | { |
61 | SetWriteHandler(0x6000,0xFFFF,Write); |
62 | SetReadHandler(0x6000,0xFFFF,CartBR); |
63 | mapbyte1[0]=1; |
64 | mapbyte1[1]=0; |
65 | Synco(); |
66 | } |