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1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 2002 Ben Parnell |
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 r1 mapbyte1[0] |
24 | #define r2 mapbyte1[1] |
25 | |
26 | static void DoBS(void) |
27 | { |
28 | if(r1&0x40) |
29 | { |
30 | ROM_BANK32((r1&0xE)|(r2&1)); |
31 | VROM_BANK8( ((r1&0xE)<<2) | ((r2>>4)&7) ); |
32 | } |
33 | else |
34 | { |
35 | ROM_BANK32(r1&0xF); |
36 | VROM_BANK8( ((r1&0xF)<<2) | ((r2>>4)&3) ); |
37 | } |
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38 | X6502_Rebase(); |
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39 | } |
40 | |
41 | static void R1Set(uint8 V) |
42 | { |
43 | if(r1) return; |
44 | r1=V; |
45 | MIRROR_SET(V>>7); |
46 | DoBS(); |
47 | } |
48 | |
49 | static void R2Set(uint8 V) |
50 | { |
51 | r2=V; |
52 | DoBS(); |
53 | } |
54 | |
55 | DECLFW(R1W) |
56 | { |
57 | R1Set(V); |
58 | } |
59 | |
60 | DECLFR(R1R) |
61 | { |
62 | uint8 r=CartBR(A); |
63 | R1Set(r); |
64 | return r; |
65 | } |
66 | |
67 | DECLFW(R2W) |
68 | { |
69 | R2Set(V); |
70 | } |
71 | |
72 | DECLFR(R2R) |
73 | { |
74 | uint8 r=CartBR(A); |
75 | R2Set(r); |
76 | return r; |
77 | } |
78 | |
79 | static void M15Restore(int version) |
80 | { |
81 | DoBS(); |
82 | MIRROR_SET(r1>>7); |
83 | } |
84 | |
85 | static void M15Reset(void) |
86 | { |
87 | r1=r2=0; |
88 | DoBS(); |
89 | MIRROR_SET(0); |
90 | } |
91 | |
92 | void Mapper234_init(void) |
93 | { |
94 | SetWriteHandler(0xff80,0xff9f,R1W); |
95 | SetReadHandler(0xff80,0xff9f,R1R); |
96 | |
97 | SetWriteHandler(0xffe8,0xfff7,R2W); |
98 | SetReadHandler(0xffe8,0xfff7,R2R); |
99 | |
100 | SetReadHandler(0x6000,0x7FFF,0); |
101 | SetWriteHandler(0x6000,0x7FFF,0); |
102 | |
103 | M15Reset(); |
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104 | |
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105 | GameStateRestore=M15Restore; |
106 | MapperReset=M15Reset; |
107 | } |
108 | |