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1 | /* FCE Ultra - NES/Famicom Emulator\r |
2 | *\r |
3 | * Copyright notice for this file:\r |
4 | * Copyright (C) 2005 CaH4e3\r |
5 | *\r |
6 | * This program is free software; you can redistribute it and/or modify\r |
7 | * it under the terms of the GNU General Public License as published by\r |
8 | * the Free Software Foundation; either version 2 of the License, or\r |
9 | * (at your option) any later version.\r |
10 | *\r |
11 | * This program is distributed in the hope that it will be useful,\r |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of\r |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r |
14 | * GNU General Public License for more details.\r |
15 | *\r |
16 | * You should have received a copy of the GNU General Public License\r |
17 | * along with this program; if not, write to the Free Software\r |
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18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA\r |
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19 | */\r |
20 | \r |
21 | #include "mapinc.h"\r |
22 | \r |
23 | static uint16 cmdreg;\r |
24 | static uint8 invalid_data;\r |
25 | static SFORMAT StateRegs[]=\r |
26 | {\r |
27 | {&invalid_data, 1, "INVD"}, \r |
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28 | {&cmdreg, 2, "CREG"},\r |
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29 | {0}\r |
30 | };\r |
31 | \r |
32 | static void Sync(void)\r |
33 | {\r |
34 | setprg16r((cmdreg&0x060)>>5,0x8000,(cmdreg&0x01C)>>2);\r |
35 | setprg16r((cmdreg&0x060)>>5,0xC000,(cmdreg&0x200)?(~0):0);\r |
36 | setmirror(((cmdreg&2)>>1)^1);\r |
37 | }\r |
38 | \r |
39 | static DECLFR(UNL8157Read)\r |
40 | {\r |
41 | if(invalid_data&&cmdreg&0x100)\r |
42 | return 0xFF;\r |
43 | else\r |
44 | return CartBR(A);\r |
45 | }\r |
46 | \r |
47 | static DECLFW(UNL8157Write)\r |
48 | {\r |
49 | cmdreg=A;\r |
50 | Sync();\r |
51 | }\r |
52 | \r |
53 | static void UNL8157Power(void)\r |
54 | {\r |
55 | setchr8(0);\r |
56 | SetWriteHandler(0x8000,0xFFFF,UNL8157Write);\r |
57 | SetReadHandler(0x8000,0xFFFF,UNL8157Read);\r |
58 | cmdreg=0x200;\r |
59 | invalid_data=1;\r |
60 | Sync();\r |
61 | }\r |
62 | \r |
63 | static void UNL8157Reset(void)\r |
64 | {\r |
65 | cmdreg=0;\r |
66 | invalid_data^=1;\r |
67 | Sync();\r |
68 | }\r |
69 | \r |
70 | static void UNL8157Restore(int version)\r |
71 | {\r |
72 | Sync();\r |
73 | }\r |
74 | \r |
75 | void UNL8157_Init(CartInfo *info)\r |
76 | {\r |
77 | info->Power=UNL8157Power;\r |
78 | info->Reset=UNL8157Reset;\r |
79 | GameStateRestore=UNL8157Restore;\r |
80 | AddExState(&StateRegs, ~0, 0, 0);\r |
81 | }\r |