fceux/mappers/83.c

132 lines
3.0 KiB
C

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