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1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
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4 | * Copyright (C) 2002 Xodnizel |
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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 | |
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23 | #define ctrl mapbyte1[6] |
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24 | |
25 | static void DoCHR(void) |
26 | { |
27 | int x; |
28 | |
29 | for(x=0;x<2;x++) |
30 | VROM_BANK2((x<<11)|((ctrl&2)<<11),mapbyte1[x]>>1); |
31 | for(x=0;x<4;x++) |
32 | VROM_BANK1((x<<10) | (((ctrl&2)^2)<<11),mapbyte1[2+x]); |
33 | } |
34 | |
35 | static DECLFW(Mapper82_write) |
36 | { |
37 | if(A<=0x7EF5) |
38 | { |
39 | mapbyte1[A&7]=V; |
40 | DoCHR(); |
41 | } |
42 | else |
43 | switch(A) |
44 | { |
45 | case 0x7ef6:ctrl=V&3; |
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46 | MIRROR_SET2(V&1); |
47 | DoCHR(); |
48 | break; |
49 | case 0x7efa:V>>=2;mapbyte2[0]=V;ROM_BANK8(0x8000,V);break; |
50 | case 0x7efb:V>>=2;mapbyte2[1]=V;ROM_BANK8(0xa000,V);break; |
51 | case 0x7efc:V>>=2;mapbyte2[2]=V;ROM_BANK8(0xc000,V);break; |
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52 | } |
53 | } |
54 | |
55 | void Mapper82_init(void) |
56 | { |
57 | ROM_BANK8(0xE000,~0); |
58 | |
59 | /* external WRAM might end at $73FF */ |
60 | SetWriteHandler(0x7ef0,0x7efc,Mapper82_write); |
61 | } |
62 | |