386f5371 |
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 |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA\r |
19 | */\r |
20 | \r |
21 | #include "mapinc.h"\r |
22 | \r |
23 | static uint8 chr_reg[4];\r |
24 | static uint8 kogame, prg_reg, nt1, nt2, mirr;\r |
25 | \r |
26 | static uint8 *WRAM=NULL;\r |
27 | static uint32 WRAMSIZE, count;\r |
28 | \r |
29 | static SFORMAT StateRegs[]=\r |
30 | {\r |
31 | {&nt1, 1, "NT1"},\r |
32 | {&nt2, 1, "NT2"},\r |
33 | {&mirr, 1, "MIRR"},\r |
34 | {&prg_reg, 1, "PRG"},\r |
35 | {&kogame, 1, "KOGAME"},\r |
36 | {&count, 4, "COUNT"},\r |
37 | {chr_reg, 4, "CHR"},\r |
38 | {0}\r |
39 | };\r |
40 | \r |
41 | static void M68NTfix(void)\r |
42 | {\r |
43 | if((!UNIFchrrama)&&(mirr&0x10))\r |
44 | {\r |
45 | PPUNTARAM = 0;\r |
46 | switch(mirr&3)\r |
47 | {\r |
48 | case 0: vnapage[0]=vnapage[2]=CHRptr[0]+(((nt1|128)&CHRmask1[0])<<10);\r |
49 | vnapage[1]=vnapage[3]=CHRptr[0]+(((nt2|128)&CHRmask1[0])<<10);\r |
50 | break;\r |
51 | case 1: vnapage[0]=vnapage[1]=CHRptr[0]+(((nt1|128)&CHRmask1[0])<<10);\r |
52 | vnapage[2]=vnapage[3]=CHRptr[0]+(((nt2|128)&CHRmask1[0])<<10);\r |
53 | break;\r |
54 | case 2: vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((nt1|128)&CHRmask1[0])<<10);\r |
55 | break;\r |
56 | case 3: vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((nt2|128)&CHRmask1[0])<<10);\r |
57 | break;\r |
58 | }\r |
59 | }\r |
60 | else\r |
61 | switch(mirr&3)\r |
62 | {\r |
63 | case 0: setmirror(MI_V); break;\r |
64 | case 1: setmirror(MI_H); break;\r |
65 | case 2: setmirror(MI_0); break;\r |
66 | case 3: setmirror(MI_1); break;\r |
67 | }\r |
68 | }\r |
69 | \r |
70 | static void Sync(void)\r |
71 | {\r |
72 | setchr2(0x0000,chr_reg[0]);\r |
73 | setchr2(0x0800,chr_reg[1]);\r |
74 | setchr2(0x1000,chr_reg[2]);\r |
75 | setchr2(0x1800,chr_reg[3]);\r |
76 | setprg8r(0x10,0x6000,0);\r |
77 | setprg16r((PRGptr[1])?kogame:0,0x8000,prg_reg);\r |
78 | setprg16(0xC000,~0);\r |
79 | }\r |
80 | \r |
81 | static DECLFR(M68Read)\r |
82 | {\r |
83 | if(!(kogame&8))\r |
84 | {\r |
85 | count++;\r |
86 | if(count==1784)\r |
87 | setprg16r(0,0x8000,prg_reg);\r |
88 | }\r |
89 | return CartBR(A);\r |
90 | }\r |
91 | \r |
92 | static DECLFW(M68WriteLo)\r |
93 | {\r |
94 | if(!V)\r |
95 | { \r |
96 | count = 0;\r |
97 | setprg16r((PRGptr[1])?kogame:0,0x8000,prg_reg);\r |
98 | }\r |
99 | }\r |
100 | \r |
101 | static DECLFW(M68WriteCHR)\r |
102 | {\r |
103 | chr_reg[(A>>12)&3]=V;\r |
104 | Sync();\r |
105 | }\r |
106 | \r |
107 | static DECLFW(M68WriteNT1)\r |
108 | {\r |
109 | nt1 = V; \r |
110 | M68NTfix();\r |
111 | }\r |
112 | \r |
113 | static DECLFW(M68WriteNT2)\r |
114 | {\r |
115 | nt2 = V; \r |
116 | M68NTfix();\r |
117 | }\r |
118 | \r |
119 | static DECLFW(M68WriteMIR)\r |
120 | {\r |
121 | mirr = V;\r |
122 | M68NTfix();\r |
123 | }\r |
124 | \r |
125 | static DECLFW(M68WriteROM)\r |
126 | {\r |
127 | prg_reg = V&7;\r |
128 | kogame = ((V>>3)&1)^1;\r |
129 | Sync();\r |
130 | }\r |
131 | \r |
132 | static void M68Power(void)\r |
133 | {\r |
134 | prg_reg = 0;\r |
135 | kogame = 0;\r |
136 | Sync();\r |
137 | M68NTfix();\r |
138 | SetReadHandler(0x6000,0x7FFF,CartBR);\r |
139 | SetReadHandler(0x8000,0xBFFF,M68Read);\r |
140 | SetReadHandler(0xC000,0xFFFF,CartBR);\r |
141 | SetWriteHandler(0x8000,0xBFFF,M68WriteCHR);\r |
142 | SetWriteHandler(0xC000,0xCFFF,M68WriteNT1);\r |
143 | SetWriteHandler(0xD000,0xDFFF,M68WriteNT2);\r |
144 | SetWriteHandler(0xE000,0xEFFF,M68WriteMIR);\r |
145 | SetWriteHandler(0xF000,0xFFFF,M68WriteROM);\r |
146 | SetWriteHandler(0x6000,0x6000,M68WriteLo);\r |
147 | SetWriteHandler(0x6001,0x7FFF,CartBW);\r |
148 | }\r |
149 | \r |
150 | static void M68Close(void)\r |
151 | {\r |
152 | if(WRAM)\r |
153 | FCEU_gfree(WRAM);\r |
154 | WRAM=NULL;\r |
155 | }\r |
156 | \r |
157 | static void StateRestore(int version)\r |
158 | {\r |
159 | Sync();\r |
160 | M68NTfix();\r |
161 | }\r |
162 | \r |
163 | void Mapper68_Init(CartInfo *info)\r |
164 | {\r |
165 | info->Power=M68Power;\r |
166 | info->Close=M68Close;\r |
167 | GameStateRestore=StateRestore;\r |
168 | WRAMSIZE=8192;\r |
169 | WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);\r |
170 | SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);\r |
171 | if(info->battery)\r |
172 | {\r |
173 | info->SaveGame[0]=WRAM;\r |
174 | info->SaveGameLen[0]=WRAMSIZE;\r |
175 | }\r |
176 | AddExState(WRAM, WRAMSIZE, 0, "WRAM");\r |
177 | AddExState(&StateRegs, ~0, 0, 0);\r |
178 | }\r |