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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 | |
23 | #define rg mapbyte1 |
24 | |
25 | static void DoSync(uint32 A) |
26 | { |
27 | int32 p=((A>>3)&0xF) | ((A>>4)&0x10); |
28 | |
29 | rg[0]=A; |
30 | rg[1]=A>>8; |
31 | |
32 | MIRROR_SET((A>>1)&1); |
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33 | if(A&1) //32 KB |
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34 | { |
35 | ROM_BANK32(p); |
36 | } |
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37 | else //16 KB |
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38 | { |
39 | ROM_BANK16(0x8000,(p<<1)|((A&4)>>2)); |
40 | ROM_BANK16(0xc000,(p<<1)|((A&4)>>2)); |
41 | } |
42 | if(A&0x80) |
43 | { |
44 | PPUCHRRAM=0; |
45 | } |
46 | else |
47 | { |
48 | PPUCHRRAM=0xFF; |
49 | if(A&0x200) |
50 | ROM_BANK16(0xC000,(p<<1)|7); |
51 | else |
52 | ROM_BANK16(0xC000,(p<<1)&(~7)); |
53 | } |
54 | } |
55 | |
56 | static DECLFW(Mapper227_write) |
57 | { |
58 | rg[A&1]=V; |
59 | DoSync(A); |
60 | } |
61 | |
62 | static void M227Reset(void) |
63 | { |
64 | rg[0]=rg[1]=0; |
65 | DoSync(0); |
66 | } |
67 | |
68 | static void M227Restore(int version) |
69 | { |
70 | DoSync(rg[0]|(rg[1]<<8)); |
71 | } |
72 | |
73 | void Mapper227_init(void) |
74 | { |
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75 | SetWriteHandler(0x6000,0xffff,Mapper227_write); |
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76 | MapperReset=M227Reset; |
77 | GameStateRestore=M227Restore; |
78 | M227Reset(); |
79 | } |