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1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 2002 Xodnizel |
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" |
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22 | #include "../ines.h" |
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23 | |
24 | static uint8 lastA; |
25 | static uint8 DRegs[8]; |
26 | static uint8 cmd; |
27 | static uint8 MirCache[8]; |
28 | |
29 | static SFORMAT DB_StateRegs[]={ |
30 | {DRegs, 8, "DREG"}, |
31 | {&cmd, 1, "CMD"}, |
32 | {&lastA, 1, "LAST"}, |
33 | {0} |
34 | }; |
35 | |
36 | static void toot(void) |
37 | { |
38 | int x; |
39 | |
40 | MirCache[0]=MirCache[1]=(DRegs[0]>>4)&1; |
41 | MirCache[2]=MirCache[3]=(DRegs[1]>>4)&1; |
42 | |
43 | for(x=0;x<4;x++) |
44 | MirCache[4+x]=(DRegs[2+x]>>5)&1; |
45 | onemir(MirCache[lastA]); |
46 | } |
47 | |
48 | static void Sync() |
49 | { |
50 | setchr2(0x0000,DRegs[0]&0x1F); |
51 | setchr2(0x0800,DRegs[1]&0x1F); |
52 | setchr1(0x1000,DRegs[2]&0x1F); |
53 | setchr1(0x1400,DRegs[3]&0x1F); |
54 | setchr1(0x1800,DRegs[4]&0x1F); |
55 | setchr1(0x1C00,DRegs[5]&0x1F); |
56 | setprg8(0x8000,DRegs[6]&0x1F); |
57 | setprg8(0xa000,DRegs[7]&0x1F); |
58 | toot(); |
59 | } |
60 | |
61 | static DECLFW(Mapper95_write) |
62 | { |
63 | switch(A&0xF001) |
64 | { |
65 | case 0x8000: cmd = V; break; |
66 | case 0x8001: |
67 | switch(cmd&0x07) |
68 | { |
69 | case 0: DRegs[0]=(V&0x3F)>>1; break; |
70 | case 1: DRegs[1]=(V&0x3F)>>1; break; |
71 | case 2: DRegs[2]=V&0x3F; break; |
72 | case 3: DRegs[3]=V&0x3F; break; |
73 | case 4: DRegs[4]=V&0x3F; break; |
74 | case 5: DRegs[5]=V&0x3F; break; |
75 | case 6: DRegs[6]=V&0x3F; break; |
76 | case 7: DRegs[7]=V&0x3F; break; |
77 | } |
78 | Sync(); |
79 | } |
80 | } |
81 | |
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82 | static void dragonbust_ppu(uint32 A) |
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83 | { |
84 | static int last=-1; |
85 | static uint8 z; |
86 | |
87 | if(A>=0x2000) return; |
88 | |
89 | A>>=10; |
90 | lastA=A; |
91 | z=MirCache[A]; |
92 | if(z!=last) |
93 | { |
94 | onemir(z); |
95 | last=z; |
96 | } |
97 | } |
98 | |
99 | static void DBPower(void) |
100 | { |
101 | memset(DRegs,0x3F,8); |
102 | DRegs[0]=DRegs[1]=0x1F; |
103 | |
104 | Sync(); |
105 | |
106 | setprg8(0xc000,0x3E); |
107 | setprg8(0xe000,0x3F); |
108 | |
109 | SetReadHandler(0x8000,0xffff,CartBR); |
110 | SetWriteHandler(0x8000,0xffff,Mapper95_write); |
111 | } |
112 | |
113 | static void StateRestore(int version) |
114 | { |
115 | Sync(); |
116 | } |
117 | |
118 | void Mapper95_Init(CartInfo *info) |
119 | { |
120 | info->Power=DBPower; |
121 | AddExState(DB_StateRegs, ~0, 0, 0); |
122 | PPU_hook=dragonbust_ppu; |
123 | GameStateRestore=StateRestore; |
124 | } |
125 | |