43725da7 |
1 | /* FCE Ultra - NES/Famicom Emulator\r |
2 | *\r |
3 | * Copyright notice for this file:\r |
4 | * Copyright (C) 2012 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 |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA\r |
19 | */\r |
20 | \r |
21 | #include "mapinc.h"\r |
22 | \r |
23 | static uint8 cregs[4], pregs[2];\r |
24 | static uint8 IRQCount, IRQa;\r |
25 | \r |
26 | static SFORMAT StateRegs[]=\r |
27 | {\r |
28 | {cregs, 4, "CREG"},\r |
29 | {pregs, 2, "PREG"},\r |
30 | {&IRQa, 1, "IRQA"},\r |
31 | {&IRQCount, 1, "IRQC"},\r |
32 | {0}\r |
33 | };\r |
34 | \r |
35 | static void Sync(void)\r |
36 | {\r |
37 | setprg8(0x8000,pregs[0]);\r |
38 | setprg8(0xa000,pregs[1]);\r |
39 | setprg8(0xc000,~1);\r |
40 | setprg8(0xe000,~0);\r |
41 | setchr2(0x0000,cregs[0]);\r |
42 | setchr2(0x0800,cregs[1]);\r |
43 | setchr2(0x1000,cregs[2]);\r |
44 | setchr2(0x1800,cregs[3]);\r |
45 | }\r |
46 | \r |
47 | static DECLFW(M91Write0)\r |
48 | {\r |
49 | cregs[A & 3] = V;\r |
50 | Sync();\r |
51 | }\r |
52 | \r |
53 | static DECLFW(M91Write1)\r |
54 | {\r |
55 | switch (A & 3)\r |
56 | {\r |
57 | case 0:\r |
58 | case 1: pregs[A & 1] = V; Sync(); break;\r |
59 | case 2: IRQa = IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;\r |
60 | case 3: IRQa = 1; X6502_IRQEnd(FCEU_IQEXT); break;\r |
61 | }\r |
62 | }\r |
63 | \r |
64 | static void M91Power(void)\r |
65 | {\r |
66 | Sync();\r |
67 | SetWriteHandler(0x6000,0x6fff,M91Write0);\r |
68 | SetWriteHandler(0x7000,0x7fff,M91Write1);\r |
69 | SetReadHandler(0x8000,0xffff,CartBR);\r |
70 | }\r |
71 | \r |
72 | static void M91IRQHook(void)\r |
73 | {\r |
74 | if(IRQCount<8 && IRQa)\r |
75 | {\r |
76 | IRQCount++;\r |
77 | if(IRQCount>=8)\r |
78 | {\r |
79 | X6502_IRQBegin(FCEU_IQEXT); \r |
80 | } \r |
81 | }\r |
82 | }\r |
83 | \r |
84 | static void StateRestore(int version)\r |
85 | {\r |
86 | Sync();\r |
87 | }\r |
88 | \r |
89 | void Mapper91_Init(CartInfo *info)\r |
90 | {\r |
91 | info->Power=M91Power;\r |
92 | GameHBIRQHook=M91IRQHook;\r |
93 | GameStateRestore=StateRestore;\r |
94 | AddExState(&StateRegs, ~0, 0, 0);\r |
95 | }\r |