e2d0dd92 |
1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
4 | * Copyright (C) 2002 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 uint8 prg_reg; |
24 | static uint8 chr_reg; |
25 | |
26 | static uint8 sim0reg, sim0bit, sim0byte, sim0parity, sim0bcnt; |
27 | static uint16 sim0data; |
28 | static uint8 sim0array[128] = |
29 | { |
30 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, |
31 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, |
32 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, |
33 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, |
34 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, |
35 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, |
36 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, |
37 | 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0xAA, |
38 | }; |
39 | |
40 | static SFORMAT StateRegs[]= |
41 | { |
42 | {&prg_reg, 1, "PREG"}, |
43 | {&chr_reg, 1, "CREG"}, |
44 | {0} |
45 | }; |
46 | |
47 | static void Sync(void) |
48 | { |
49 | setprg32(0x8000, prg_reg); |
50 | setchr8(chr_reg); |
51 | } |
52 | |
53 | static void StateRestore(int version) |
54 | { |
55 | Sync(); |
56 | } |
57 | |
58 | static DECLFW(M216WriteHi) |
59 | { |
60 | // FCEU_printf("%04x:%04x\n",A,V); |
61 | prg_reg=A&1; |
62 | chr_reg=(A&0x0E)>>1; |
63 | Sync(); |
64 | } |
65 | |
66 | static DECLFW(M216Write5000) |
67 | { |
68 | // FCEU_printf("WRITE: %04x:%04x\n",A,V); |
69 | sim0reg=V; |
70 | if(!sim0reg) |
71 | { |
72 | sim0bit=sim0byte=sim0parity=0; |
73 | sim0data=sim0array[0]; |
74 | sim0bcnt=0x80; |
75 | } |
76 | else if(sim0reg&0x20) |
77 | { |
78 | sim0bcnt=0x20; |
79 | } |
80 | } |
81 | |
82 | static DECLFR(M216Read5000) |
83 | { |
84 | if(sim0reg&0x60) |
85 | { |
86 | sim0reg=(sim0reg^(sim0reg<<1))&0x40; |
87 | return sim0reg; |
88 | } |
89 | else |
90 | { |
91 | uint8 sim0out=0; |
92 | if(sim0bit<8) |
93 | { |
94 | // sim0data=((sim0array[sim0byte]<<(sim0bit))&0x80)>>1; |
95 | sim0out=(sim0data&1)<<6; |
96 | sim0data>>=1; |
97 | sim0bit++; |
98 | sim0parity+=sim0data; |
99 | } |
100 | else if(sim0bit==8) |
101 | { |
102 | sim0bit++; |
103 | sim0out=sim0parity&1; |
104 | } |
105 | else if(sim0bit==9) |
106 | { |
107 | if(sim0byte==sim0bcnt) |
108 | sim0out=0x60; |
109 | else |
110 | { |
111 | sim0bit=0; |
112 | sim0byte++; |
113 | sim0data=sim0array[sim0byte]; |
114 | sim0out=0; |
115 | } |
116 | } |
117 | // FCEU_printf("READ: %04x (%04x-%02x,%04x)\n",A,X.PC,sim0out,sim0byte); |
118 | return sim0out; |
119 | } |
120 | } |
121 | |
122 | static void Power(void) |
123 | { |
124 | prg_reg = 0; |
125 | chr_reg = 0; |
126 | Sync(); |
127 | SetReadHandler(0x8000,0xFFFF,CartBR); |
128 | SetWriteHandler(0x8000,0xFFFF,M216WriteHi); |
129 | SetWriteHandler(0x5000,0x5000,M216Write5000); |
130 | SetReadHandler(0x5000,0x5000,M216Read5000); |
131 | } |
132 | |
133 | |
134 | void Mapper216_Init(CartInfo *info) |
135 | { |
136 | info->Power=Power; |
137 | GameStateRestore=StateRestore; |
138 | AddExState(&StateRegs, ~0, 0, 0); |
139 | } |