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