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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 |
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18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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19 | * (VRC4 mapper) |
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20 | */ |
21 | |
22 | #include "mapinc.h" |
23 | |
24 | #define K4buf mapbyte2 |
25 | |
26 | |
27 | |
28 | DECLFW(Mapper22_write) |
29 | { |
30 | if(A<=0xAFFF) |
31 | { |
32 | switch(A&0xF000) |
33 | { |
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34 | case 0x8000:ROM_BANK8(0x8000,V);break; |
35 | case 0xa000:ROM_BANK8(0xA000,V);break; |
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36 | case 0x9000:switch(V&3) |
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37 | { |
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38 | case 0x00:MIRROR_SET2(1);break; |
39 | case 0x01:MIRROR_SET2(0);break; |
40 | case 0x02:onemir(0);break; |
41 | case 0x03:onemir(1);break; |
42 | } |
43 | break; |
44 | } |
45 | } |
46 | else |
47 | { |
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48 | A&=0xF003; |
49 | if(A>=0xb000 && A<=0xe003) |
50 | { |
51 | int x=(A&1)|((A-0xB000)>>11); |
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52 | |
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53 | K4buf[x]&=(0xF0)>>((A&2)<<1); |
54 | K4buf[x]|=(V&0xF)<<((A&2)<<1); |
55 | VROM_BANK1(x<<10,K4buf[x]>>1); |
56 | } |
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57 | } |
58 | } |
59 | |
60 | |
61 | void Mapper22_init(void) |
62 | { |
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63 | SetWriteHandler(0x8000,0xffff,Mapper22_write); |
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64 | } |