1 /* FCE Ultra - NES/Famicom Emulator
3 * Copyright notice for this file:
4 * Copyright (C) 2002 Xodnizel
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.
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.
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 static uint8 is2kbank, isnot2kbank, dipreg;
25 /*void Mapper83_init(void)
30 static void m83IRQHook(int a)
37 X6502_IRQBegin(FCEU_IQEXT);
59 static void m83prg(void)
61 ROM_BANK16(0x8000,(mapbyte1[0]&0x3F));
62 ROM_BANK16(0xC000,(mapbyte1[0]&0x30)|0xF);
65 static void m83chr(void)
67 if(is2kbank&&!isnot2kbank)
69 VROM_BANK2(0x0000,mapbyte2[0]);
70 VROM_BANK2(0x0800,mapbyte2[1]);
71 VROM_BANK2(0x1000,mapbyte2[6]);
72 VROM_BANK2(0x1800,mapbyte2[7]);
78 VROM_BANK1(x*0x400,mapbyte2[x]|((mapbyte1[0]&0x30)<<4));
82 static DECLFW(Mapper83_write)
84 //printf("$%04x:$%02x\n",A,V);
87 case 0x8000: is2kbank = 1;
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;
107 case 0x8200:IRQCount&=0xFF00;IRQCount|=V;X6502_IRQEnd(FCEU_IQEXT);break;
108 case 0x8201:IRQa=mapbyte3[0];IRQCount&=0xFF;IRQCount|=V<<8;break;
109 case 0x8300:ROM_BANK8(0x8000,V);break;
110 case 0x8301:ROM_BANK8(0xA000,V);break;
111 case 0x8302:ROM_BANK8(0xC000,V);break;
112 case 0x8310:mapbyte2[0]=V;m83chr();break;
113 case 0x8311:mapbyte2[1]=V;m83chr();break;
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;
118 case 0x8316:mapbyte2[6]=V;m83chr();break;
119 case 0x8317:mapbyte2[7]=V;m83chr();break;
120 case 0x8318:mapbyte1[1]=V;m83prg();break;
122 // printf("$%04x:$%02x, $%04x\n",A,V,X.PC.W);
126 static void m83Reset(void)
131 void Mapper83_init(void)
136 ROM_BANK8(0xc000,0x1e);
137 ROM_BANK8(0xe000,0x1f);
139 MapIRQHook=m83IRQHook;
140 MapperReset=m83Reset;
142 SetReadHandler(0x5000,0x5000,rd5000); // title scren dip switch
143 SetReadHandler(0x5100,0x5103,rdlow);
144 SetWriteHandler(0x5100,0x5103,wrlow);
145 SetWriteHandler(0x8000,0xffff,Mapper83_write);