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1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
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4 | * Copyright (C) 2003 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 | static void Sync(void) |
24 | { |
25 | int x; |
26 | |
27 | setmirror(((mapbyte1[0]>>6)&1)^1); |
28 | switch(mapbyte1[1]&0x3) |
29 | { |
30 | case 0x0: |
31 | for(x=0;x<4;x++) |
32 | setprg8(0x8000+x*8192,(((mapbyte1[0]&0x7F)<<1)+x)^(mapbyte1[0]>>7)); |
33 | break; |
34 | case 0x2: |
35 | for(x=0;x<4;x++) |
36 | setprg8(0x8000+x*8192,((mapbyte1[0]&0x7F)<<1)+(mapbyte1[0]>>7)); |
37 | break; |
38 | case 0x1: |
39 | case 0x3: |
40 | for(x=0;x<4;x++) |
41 | { |
42 | unsigned int b; |
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43 | |
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44 | b=mapbyte1[0]&0x7F; |
45 | if(x>=2 && !(mapbyte1[1]&0x2)) |
46 | b=0x7F; |
47 | setprg8(0x8000+x*8192,(x&1)+((b<<1)^(mapbyte1[0]>>7))); |
48 | } |
49 | break; |
50 | } |
51 | } |
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52 | |
53 | |
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54 | static DECLFW(Mapper15_write) |
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55 | { |
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56 | mapbyte1[0]=V; |
57 | mapbyte1[1]=A&3; |
58 | Sync(); |
59 | } |
60 | |
61 | static void StateRestore(int version) |
62 | { |
63 | Sync(); |
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64 | } |
65 | |
66 | void Mapper15_init(void) |
67 | { |
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68 | mapbyte1[0]=mapbyte1[1]=0; |
69 | Sync(); |
70 | GameStateRestore=StateRestore; |
71 | SetWriteHandler(0x8000,0xFFFF,Mapper15_write); |
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72 | } |
73 | |