fceux/mappers/91.cpp

60 lines
1.6 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"
static DECLFW(Mapper91_write)
{
//if(A>=0x7001)
//printf("$%04x:$%02x, %d\n",A,V,scanline);
A&=0xF007;
if(A>=0x6000 && A<=0x6003) VROM_BANK2((A&3)*2048,V);
else switch(A&0xF003)
{
case 0x7000:
case 0x7001:ROM_BANK8(0x8000+(A&1)*8192,V);break;
case 0x7002:IRQa=IRQCount=0;X6502_IRQEnd(FCEU_IQEXT);break;
case 0x7003:IRQa=1;X6502_IRQEnd(FCEU_IQEXT);break;
// default: printf("Iyee: $%04x:$%02x\n",A,V);break;
}
//if(A>=0x7000)
// printf("$%04x:$%02x, %d\n",A,V,scanline);
}
static void Mapper91_hb(void)
{
if(IRQCount<8 && IRQa)
{
IRQCount++;
if(IRQCount>=8)
{
X6502_IRQBegin(FCEU_IQEXT);
}
}
}
void Mapper91_init(void)
{
SetWriteHandler(0x4020,0xFFFF,Mapper91_write);
GameHBIRQHook=Mapper91_hb;
}