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1 | /* FCE Ultra - NES/Famicom Emulator |
2 | * |
3 | * Copyright notice for this file: |
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4 | * Copyright (C) 2002 Xodnizel |
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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 |
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18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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19 | */ |
20 | |
21 | #include "mapinc.h" |
22 | |
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23 | static uint8 is2kbank, isnot2kbank, dipreg; |
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24 | |
25 | /*void Mapper83_init(void) |
26 | { |
27 | |
28 | } |
29 | */ |
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30 | static void m83IRQHook(int a) |
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31 | { |
32 | if(IRQa) |
33 | { |
34 | IRQCount-=a; |
35 | if(IRQCount<0) |
36 | { |
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37 | X6502_IRQBegin(FCEU_IQEXT); |
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38 | IRQa=0; |
39 | IRQCount=0xFFFF; |
40 | } |
41 | } |
42 | } |
43 | |
44 | static DECLFW(wrlow) |
45 | { |
46 | mapbyte4[A&3]=V; |
47 | } |
48 | |
49 | static DECLFR(rdlow) |
50 | { |
51 | return mapbyte4[A&3]; |
52 | } |
53 | |
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54 | static DECLFR(rd5000) |
55 | { |
56 | return dipreg; |
57 | } |
58 | |
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59 | static void m83prg(void) |
60 | { |
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61 | ROM_BANK16(0x8000,(mapbyte1[0]&0x3F)); |
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62 | ROM_BANK16(0xC000,(mapbyte1[0]&0x30)|0xF); |
63 | } |
64 | |
65 | static void m83chr(void) |
66 | { |
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67 | if(is2kbank&&!isnot2kbank) |
68 | { |
69 | VROM_BANK2(0x0000,mapbyte2[0]); |
70 | VROM_BANK2(0x0800,mapbyte2[1]); |
71 | VROM_BANK2(0x1000,mapbyte2[6]); |
72 | VROM_BANK2(0x1800,mapbyte2[7]); |
73 | } |
74 | else |
75 | { |
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76 | int x; |
77 | for(x=0;x<8;x++) |
78 | VROM_BANK1(x*0x400,mapbyte2[x]|((mapbyte1[0]&0x30)<<4)); |
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79 | } |
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80 | } |
81 | |
82 | static DECLFW(Mapper83_write) |
83 | { |
84 | //printf("$%04x:$%02x\n",A,V); |
85 | switch(A) |
86 | { |
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87 | case 0x8000: is2kbank = 1; |
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88 | case 0xB000: |
89 | case 0xB0FF: |
90 | case 0xB1FF: |
91 | { |
92 | mapbyte1[0]=V; |
93 | m83prg(); |
94 | m83chr(); |
95 | } |
96 | break; |
97 | case 0x8100: |
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98 | mapbyte3[0]=V&0x80; |
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99 | switch(V&0x3) |
100 | { |
101 | case 0x00:MIRROR_SET2(1);break; |
102 | case 0x01:MIRROR_SET2(0);break; |
103 | case 0x02:onemir(0);break; |
104 | case 0x03:onemir(1);break; |
105 | } |
106 | break; |
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107 | case 0x8200:IRQCount&=0xFF00;IRQCount|=V;X6502_IRQEnd(FCEU_IQEXT);break; |
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108 | case 0x8201:IRQa=mapbyte3[0];IRQCount&=0xFF;IRQCount|=V<<8;break; |
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109 | case 0x8300:ROM_BANK8(0x8000,V);break; |
110 | case 0x8301:ROM_BANK8(0xA000,V);break; |
111 | case 0x8302:ROM_BANK8(0xC000,V);break; |
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112 | case 0x8310:mapbyte2[0]=V;m83chr();break; |
113 | case 0x8311:mapbyte2[1]=V;m83chr();break; |
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114 | case 0x8312:mapbyte2[2]=V;isnot2kbank = 1;m83chr();break; // 2 mappers in one :) |
115 | case 0x8313:mapbyte2[3]=V;isnot2kbank = 1;m83chr();break; |
116 | case 0x8314:mapbyte2[4]=V;isnot2kbank = 1;m83chr();break; |
117 | case 0x8315:mapbyte2[5]=V;isnot2kbank = 1;m83chr();break; |
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118 | case 0x8316:mapbyte2[6]=V;m83chr();break; |
119 | case 0x8317:mapbyte2[7]=V;m83chr();break; |
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120 | case 0x8318:mapbyte1[1]=V;m83prg();break; |
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121 | } |
122 | // printf("$%04x:$%02x, $%04x\n",A,V,X.PC.W); |
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123 | |
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124 | } |
125 | |
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126 | static void m83Reset(void) |
127 | { |
128 | dipreg^=1; |
129 | } |
130 | |
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131 | void Mapper83_init(void) |
132 | { |
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133 | is2kbank = 0; |
134 | isnot2kbank = 0; |
135 | dipreg = 0; |
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136 | ROM_BANK8(0xc000,0x1e); |
137 | ROM_BANK8(0xe000,0x1f); |
138 | |
139 | MapIRQHook=m83IRQHook; |
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140 | MapperReset=m83Reset; |
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141 | |
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142 | SetReadHandler(0x5000,0x5000,rd5000); // title scren dip switch |
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143 | SetReadHandler(0x5100,0x5103,rdlow); |
144 | SetWriteHandler(0x5100,0x5103,wrlow); |
145 | SetWriteHandler(0x8000,0xffff,Mapper83_write); |
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146 | mapbyte1[1]=0xF; |
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147 | } |