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 | |
21 | #include "mapinc.h" |
22 | |
23 | static uint16 cmdreg; |
24 | static uint8 invalid_data; |
25 | static SFORMAT StateRegs[]= |
26 | { |
27 | {&cmdreg, 2, "CMDREG"}, |
28 | {0} |
29 | }; |
30 | |
31 | static void Sync(void) |
32 | { |
33 | setprg16r((cmdreg&0x060)>>5,0x8000,(cmdreg&0x01C)>>2); |
34 | setprg16r((cmdreg&0x060)>>5,0xC000,(cmdreg&0x200)?(~0):0); |
35 | setmirror(((cmdreg&2)>>1)^1); |
36 | } |
37 | |
38 | static DECLFR(UNL8157Read) |
39 | { |
40 | if(invalid_data&&cmdreg&0x100) |
41 | return 0xFF; |
42 | else |
43 | return CartBR(A); |
44 | } |
45 | |
46 | static DECLFW(UNL8157Write) |
47 | { |
48 | cmdreg=A; |
49 | Sync(); |
50 | } |
51 | |
52 | static void UNL8157Power(void) |
53 | { |
54 | setchr8(0); |
55 | SetWriteHandler(0x8000,0xFFFF,UNL8157Write); |
56 | SetReadHandler(0x8000,0xFFFF,UNL8157Read); |
57 | cmdreg=0x200; |
58 | invalid_data=1; |
59 | Sync(); |
60 | } |
61 | |
62 | static void UNL8157Reset(void) |
63 | { |
64 | cmdreg=0; |
65 | invalid_data^=1; |
66 | Sync(); |
67 | } |
68 | |
69 | static void UNL8157Restore(int version) |
70 | { |
71 | Sync(); |
72 | } |
73 | |
74 | void UNL8157_Init(CartInfo *info) |
75 | { |
76 | info->Power=UNL8157Power; |
77 | info->Reset=UNL8157Reset; |
78 | GameStateRestore=UNL8157Restore; |
79 | AddExState(&StateRegs, ~0, 0, 0); |
80 | } |