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1 | /* FCE Ultra - NES/Famicom Emulator\r |
2 | *\r |
3 | * Copyright notice for this file:\r |
4 | * Copyright (C) 2006 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 |
43725da7 |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA\r |
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19 | *\r |
20 | */\r |
21 | \r |
22 | #include "mapinc.h"\r |
23 | \r |
24 | static uint16 latchea;\r |
25 | static uint8 latched;\r |
26 | static uint8 *WRAM=NULL;\r |
27 | static uint32 WRAMSIZE;\r |
28 | static SFORMAT StateRegs[]=\r |
29 | {\r |
30 | {&latchea, 2, "AREG"},\r |
31 | {&latched, 1, "DREG"},\r |
32 | {0}\r |
33 | };\r |
34 | \r |
35 | static void Sync(void)\r |
36 | {\r |
37 | int i;\r |
38 | setmirror(((latched>>6)&1)^1);\r |
39 | switch(latchea)\r |
40 | {\r |
41 | case 0x8000:\r |
42 | for(i=0;i<4;i++)\r |
43 | setprg8(0x8000+(i<<13),(((latched&0x7F)<<1)+i)^(latched>>7));\r |
44 | break;\r |
45 | case 0x8002:\r |
46 | for(i=0;i<4;i++)\r |
47 | setprg8(0x8000+(i<<13),((latched&0x7F)<<1)+(latched>>7));\r |
48 | break;\r |
49 | case 0x8001:\r |
50 | case 0x8003:\r |
51 | for(i=0;i<4;i++)\r |
52 | {\r |
53 | unsigned int b;\r |
54 | b=latched&0x7F;\r |
55 | if(i>=2 && !(latchea&0x2))\r |
56 | i=0x7F;\r |
57 | setprg8(0x8000+(i<<13),(i&1)+((b<<1)^(latched>>7)));\r |
58 | }\r |
59 | break;\r |
60 | }\r |
61 | }\r |
62 | \r |
63 | static DECLFW(M15Write)\r |
64 | {\r |
65 | latchea=A;\r |
66 | latched=V;\r |
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67 | Sync();\r |
68 | }\r |
69 | \r |
70 | static void StateRestore(int version)\r |
71 | {\r |
72 | Sync();\r |
73 | }\r |
74 | \r |
75 | static void M15Power(void)\r |
76 | {\r |
77 | latchea=0x8000;\r |
78 | latched=0;\r |
79 | setchr8(0);\r |
80 | setprg8r(0x10,0x6000,0);\r |
81 | SetReadHandler(0x6000,0x7FFF,CartBR);\r |
82 | SetWriteHandler(0x6000,0x7FFF,CartBW);\r |
83 | SetWriteHandler(0x8000,0xFFFF,M15Write);\r |
84 | SetReadHandler(0x8000,0xFFFF,CartBR);\r |
85 | Sync();\r |
86 | }\r |
87 | \r |
88 | static void M15Reset(void)\r |
89 | {\r |
90 | latchea=0x8000;\r |
91 | latched=0;\r |
92 | Sync();\r |
93 | }\r |
94 | \r |
95 | static void M15Close(void)\r |
96 | {\r |
97 | if(WRAM)\r |
98 | FCEU_gfree(WRAM);\r |
99 | WRAM=NULL;\r |
100 | }\r |
101 | \r |
102 | void Mapper15_Init(CartInfo *info)\r |
103 | {\r |
104 | info->Power=M15Power;\r |
105 | info->Reset=M15Reset;\r |
106 | info->Close=M15Close;\r |
107 | GameStateRestore=StateRestore;\r |
108 | WRAMSIZE=8192;\r |
109 | WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);\r |
110 | SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);\r |
111 | if(info->battery)\r |
112 | {\r |
113 | info->SaveGame[0]=WRAM;\r |
114 | info->SaveGameLen[0]=WRAMSIZE;\r |
115 | }\r |
116 | AddExState(WRAM, WRAMSIZE, 0, "WRAM");\r |
117 | AddExState(&StateRegs, ~0, 0, 0);\r |
118 | }\r |
119 | \r |