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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | */ |
20 | |
21 | #include "mapinc.h" |
22 | |
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23 | //zero 14-apr-2012 - redid this entirely to match bizhawk |
24 | |
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25 | #define rg mapbyte1 |
26 | |
27 | static void DoSync(uint32 A) |
28 | { |
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29 | int S = A & 1; |
30 | int M_horz = (A>>1)&1; |
31 | int p = (A >> 2) & 0x1F; |
32 | p += (A&0x100) ? 0x20 : 0; |
33 | bool o = (A>>7)&1; |
34 | bool L = (A>>9)&1; |
35 | |
36 | if (o && !S ) |
37 | { |
38 | ROM_BANK16(0x8000,p); |
39 | ROM_BANK16(0xC000,p); |
40 | } |
41 | if (o && S ) |
42 | { |
43 | ROM_BANK16(0x8000,p); |
44 | ROM_BANK16(0xC000,p+1); |
45 | } |
46 | if (!o && !S && !L ) |
47 | { |
48 | ROM_BANK16(0x8000,p); |
49 | ROM_BANK16(0xC000,p&0x38); |
50 | } |
51 | if (!o && S && !L ) |
52 | { |
53 | ROM_BANK16(0x8000,p&0x3E); |
54 | ROM_BANK16(0xC000,p&0x38); |
55 | } |
56 | if (!o && !S && L) |
57 | { |
58 | ROM_BANK16(0x8000,p); |
59 | ROM_BANK16(0xC000,p|7); |
60 | } |
61 | if (!o && S && L ) |
62 | { |
63 | ROM_BANK16(0x8000,p&0x3E); |
64 | ROM_BANK16(0xC000,p|7); |
65 | } |
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66 | |
67 | rg[0]=A; |
68 | rg[1]=A>>8; |
69 | |
70 | MIRROR_SET((A>>1)&1); |
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71 | } |
72 | |
73 | static DECLFW(Mapper227_write) |
74 | { |
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75 | DoSync(A); |
76 | } |
77 | |
78 | static void M227Reset(void) |
79 | { |
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80 | DoSync(0); |
81 | } |
82 | |
83 | static void M227Restore(int version) |
84 | { |
85 | DoSync(rg[0]|(rg[1]<<8)); |
86 | } |
87 | |
88 | void Mapper227_init(void) |
89 | { |
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90 | SetWriteHandler(0x8000,0xffff,Mapper227_write); |
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91 | MapperReset=M227Reset; |
92 | GameStateRestore=M227Restore; |
93 | M227Reset(); |
94 | } |