d97315ac |
1 | /* FCE Ultra - NES/Famicom Emulator\r |
2 | *\r |
3 | * Copyright notice for this file:\r |
4 | * Copyright (C) 2002 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 prg_reg;\r |
24 | static uint8 chr_reg;\r |
25 | \r |
26 | static uint8 sim0reg, sim0bit, sim0byte, sim0parity, sim0bcnt;\r |
27 | static uint16 sim0data;\r |
28 | static uint8 sim0array[128] =\r |
29 | {\r |
30 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
31 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
32 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
33 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
34 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
35 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
36 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10,\r |
37 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0xAA,\r |
38 | };\r |
39 | \r |
40 | static SFORMAT StateRegs[]=\r |
41 | {\r |
42 | {&prg_reg, 1, "PREG"},\r |
43 | {&chr_reg, 1, "CREG"},\r |
44 | {0}\r |
45 | };\r |
46 | \r |
47 | static void Sync(void)\r |
48 | {\r |
49 | setprg32(0x8000, prg_reg);\r |
50 | setchr8(chr_reg);\r |
51 | }\r |
52 | \r |
53 | static void StateRestore(int version)\r |
54 | {\r |
55 | Sync();\r |
56 | }\r |
57 | \r |
58 | static DECLFW(M216WriteHi)\r |
59 | {\r |
60 | // FCEU_printf("%04x:%04x\n",A,V);\r |
61 | prg_reg=A&1;\r |
62 | chr_reg=(A&0x0E)>>1;\r |
63 | Sync();\r |
64 | }\r |
65 | \r |
66 | static DECLFW(M216Write5000)\r |
67 | {\r |
68 | // FCEU_printf("WRITE: %04x:%04x\n",A,V);\r |
69 | sim0reg=V;\r |
70 | if(!sim0reg)\r |
71 | {\r |
72 | sim0bit=sim0byte=sim0parity=0;\r |
73 | sim0data=sim0array[0];\r |
74 | sim0bcnt=0x80;\r |
75 | }\r |
76 | else if(sim0reg&0x20)\r |
77 | {\r |
78 | sim0bcnt=0x20;\r |
79 | }\r |
80 | }\r |
81 | \r |
82 | static DECLFR(M216Read5000)\r |
83 | {\r |
84 | if(sim0reg&0x60)\r |
85 | {\r |
86 | sim0reg=(sim0reg^(sim0reg<<1))&0x40;\r |
87 | return sim0reg;\r |
88 | }\r |
89 | else\r |
90 | {\r |
91 | uint8 sim0out=0;\r |
92 | if(sim0bit<8)\r |
93 | {\r |
94 | // sim0data=((sim0array[sim0byte]<<(sim0bit))&0x80)>>1;\r |
95 | sim0out=(sim0data&1)<<6;\r |
96 | sim0data>>=1;\r |
97 | sim0bit++;\r |
98 | sim0parity+=sim0data;\r |
99 | }\r |
100 | else if(sim0bit==8)\r |
101 | {\r |
102 | sim0bit++;\r |
103 | sim0out=sim0parity&1;\r |
104 | }\r |
105 | else if(sim0bit==9)\r |
106 | {\r |
107 | if(sim0byte==sim0bcnt)\r |
108 | sim0out=0x60;\r |
109 | else\r |
110 | {\r |
111 | sim0bit=0;\r |
112 | sim0byte++;\r |
113 | sim0data=sim0array[sim0byte];\r |
114 | sim0out=0;\r |
115 | }\r |
116 | }\r |
117 | // FCEU_printf("READ: %04x (%04x-%02x,%04x)\n",A,X.PC,sim0out,sim0byte);\r |
118 | return sim0out;\r |
119 | }\r |
120 | }\r |
121 | \r |
122 | static void Power(void)\r |
123 | {\r |
124 | prg_reg = 0;\r |
125 | chr_reg = 0;\r |
126 | Sync();\r |
127 | SetReadHandler(0x8000,0xFFFF,CartBR);\r |
128 | SetWriteHandler(0x8000,0xFFFF,M216WriteHi);\r |
129 | SetWriteHandler(0x5000,0x5000,M216Write5000);\r |
130 | SetReadHandler(0x5000,0x5000,M216Read5000);\r |
131 | }\r |
132 | \r |
133 | \r |
134 | void Mapper216_Init(CartInfo *info)\r |
135 | {\r |
136 | info->Power=Power;\r |
137 | GameStateRestore=StateRestore;\r |
138 | AddExState(&StateRegs, ~0, 0, 0);\r |
139 | }\r |