132 lines
3.0 KiB
C
132 lines
3.0 KiB
C
/* FCE Ultra - NES/Famicom Emulator
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*
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* Copyright notice for this file:
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* Copyright (C) 2002 Xodnizel
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "mapinc.h"
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/*void Mapper83_init(void)
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{
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}
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*/
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static void FP_FASTAPASS(1) m83IRQHook(int a)
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{
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if(IRQa)
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{
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IRQCount-=a;
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if(IRQCount<0)
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{
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X6502_IRQBegin(FCEU_IQEXT);
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IRQa=0;
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IRQCount=0xFFFF;
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}
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}
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}
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static DECLFW(wrlow)
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{
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mapbyte4[A&3]=V;
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}
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static DECLFR(rdlow)
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{
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return mapbyte4[A&3];
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}
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static void m83prg(void)
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{
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ROM_BANK16(0x8000,(mapbyte1[0]&0x3F));
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ROM_BANK16(0xC000,(mapbyte1[0]&0x30)|0xF);
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}
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static void m83chr(void)
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{
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// if(0)
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// {
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// VROM_BANK2(0x0000,mapbyte2[0]);
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// VROM_BANK2(0x0800,mapbyte2[1]);
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// VROM_BANK2(0x1000,mapbyte2[6]);
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// VROM_BANK2(0x1800,mapbyte2[7]);
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// }
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// else
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// {
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int x;
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for(x=0;x<8;x++)
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VROM_BANK1(x*0x400,mapbyte2[x]|((mapbyte1[0]&0x30)<<4));
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// }
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}
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static DECLFW(Mapper83_write)
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{
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//printf("$%04x:$%02x\n",A,V);
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switch(A)
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{
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case 0x8000:
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case 0xB000:
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case 0xB0FF:
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case 0xB1FF:
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{
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mapbyte1[0]=V;
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m83prg();
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m83chr();
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}
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break;
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case 0x8100:
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mapbyte3[0]=V&0x80;
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switch(V&0x3)
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{
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case 0x00:MIRROR_SET2(1);break;
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case 0x01:MIRROR_SET2(0);break;
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case 0x02:onemir(0);break;
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case 0x03:onemir(1);break;
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}
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break;
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case 0x8200:IRQCount&=0xFF00;IRQCount|=V;X6502_IRQEnd(FCEU_IQEXT);break;
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case 0x8201:IRQa=mapbyte3[0];IRQCount&=0xFF;IRQCount|=V<<8;break;
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case 0x8300:ROM_BANK8(0x8000,V);break;
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case 0x8301:ROM_BANK8(0xA000,V);break;
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case 0x8302:ROM_BANK8(0xC000,V);break;
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case 0x8310:mapbyte2[0]=V;m83chr();break;
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case 0x8311:mapbyte2[1]=V;m83chr();break;
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case 0x8312:mapbyte2[2]=V;m83chr();break;
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case 0x8313:mapbyte2[3]=V;m83chr();break;
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case 0x8314:mapbyte2[4]=V;m83chr();break;
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case 0x8315:mapbyte2[5]=V;m83chr();break;
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case 0x8316:mapbyte2[6]=V;m83chr();break;
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case 0x8317:mapbyte2[7]=V;m83chr();break;
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case 0x8318:mapbyte1[1]=V;m83prg();break;
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}
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// printf("$%04x:$%02x, $%04x\n",A,V,X.PC.W);
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}
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void Mapper83_init(void)
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{
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ROM_BANK8(0xc000,0x1e);
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ROM_BANK8(0xe000,0x1f);
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MapIRQHook=m83IRQHook;
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SetReadHandler(0x5100,0x5103,rdlow);
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SetWriteHandler(0x5100,0x5103,wrlow);
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SetWriteHandler(0x8000,0xffff,Mapper83_write);
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mapbyte1[1]=0xF;
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}
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