e2d0dd92 |
1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 2005 CaH4e3 |
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 | * Gimmick Bootleg |
21 | */ |
22 | |
23 | #include "mapinc.h" |
24 | |
25 | static uint8 prg[4]; |
26 | static uint8 chr[8]; |
27 | static uint8 IRQCount; |
28 | static uint8 IRQPre; |
29 | static uint8 IRQa; |
30 | |
31 | static SFORMAT StateRegs[]= |
32 | { |
33 | {prg, 4, "PRG"}, |
34 | {chr, 8, "CHR"}, |
35 | {&IRQCount, 1, "IRQCOUNT"}, |
36 | {&IRQPre, 1, "IRQPRE"}, |
37 | {&IRQa, 1, "IRQA"}, |
38 | {0} |
39 | }; |
40 | |
41 | static void SyncPrg(void) |
42 | { |
43 | setprg8(0x6000,0); |
44 | setprg8(0x8000,prg[0]); |
45 | setprg8(0xA000,prg[1]); |
46 | setprg8(0xC000,prg[2]); |
47 | setprg8(0xE000,~0); |
48 | } |
49 | |
50 | static void SyncChr(void) |
51 | { |
52 | int i; |
53 | for(i=0; i<8; i++) |
54 | setchr1(i<<10,chr[i]); |
55 | } |
56 | |
57 | static void StateRestore(int version) |
58 | { |
59 | SyncPrg(); |
60 | SyncChr(); |
61 | } |
62 | |
63 | static DECLFW(M183Write) |
64 | { |
65 | if(((A&0xF80C)>=0xB000)&&((A&0xF80C)<=0xE00C)) |
66 | { |
67 | uint8 index=(((A&0x7000)>>11)-6)|((A&8)>>3); |
68 | chr[index]=(chr[index]&(0xF0>>(A&4)))|((V&0x0F)<<(A&4)); |
69 | SyncChr(); |
70 | } |
71 | else switch (A&0xF80C) |
72 | { |
73 | case 0x8800: prg[0]=V; SyncPrg(); break; |
74 | case 0xA800: prg[1]=V; SyncPrg(); break; |
75 | case 0xA000: prg[2]=V; SyncPrg(); break; |
76 | case 0x9800: switch (V&3) |
77 | { |
78 | case 0: setmirror(MI_V); break; |
79 | case 1: setmirror(MI_H); break; |
80 | case 2: setmirror(MI_0); break; |
81 | case 3: setmirror(MI_1); break; |
82 | } |
83 | break; |
84 | case 0xF000: IRQCount=((IRQCount&0xF0)|(V&0xF)); break; |
85 | case 0xF004: IRQCount=((IRQCount&0x0F)|((V&0xF)<<4)); break; |
86 | case 0xF008: IRQa=V; if(!V)IRQPre=0; X6502_IRQEnd(FCEU_IQEXT); break; |
87 | case 0xF00C: IRQPre=16; break; |
88 | } |
89 | } |
90 | |
91 | static void M183IRQCounter(void) |
92 | { |
93 | if(IRQa) |
94 | { |
95 | IRQCount++; |
96 | if((IRQCount-IRQPre)==238) |
97 | X6502_IRQBegin(FCEU_IQEXT); |
98 | } |
99 | } |
100 | |
101 | static void M183Power(void) |
102 | { |
103 | IRQPre=IRQCount=IRQa=0; |
104 | SetReadHandler(0x8000,0xFFFF,CartBR); |
105 | SetWriteHandler(0x8000,0xFFFF,M183Write); |
106 | SetReadHandler(0x6000,0x7FFF,CartBR); |
107 | SyncPrg(); |
108 | SyncChr(); |
109 | } |
110 | |
111 | void Mapper183_Init(CartInfo *info) |
112 | { |
113 | info->Power=M183Power; |
114 | GameHBIRQHook=M183IRQCounter; |
115 | GameStateRestore=StateRestore; |
116 | AddExState(&StateRegs, ~0, 0, 0); |
117 | } |