fceux/mappers/40.cpp

59 lines
1.4 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(Mapper40_write)
{
switch(A&0xe000)
{
case 0x8000:IRQa=0;IRQCount=0;X6502_IRQEnd(FCEU_IQEXT);break;
case 0xa000:IRQa=1;break;
case 0xe000:ROM_BANK8(0xc000,V&7);break;
}
}
static void FP_FASTAPASS(1) Mapper40IRQ(int a)
{
if(IRQa)
{
if(IRQCount<4096)
IRQCount+=a;
else
{
IRQa=0;
X6502_IRQBegin(FCEU_IQEXT);
}
}
}
void Mapper40_init(void)
{
ROM_BANK8(0x6000,(~0)-1);
ROM_BANK8(0x8000,(~0)-3);
ROM_BANK8(0xa000,(~0)-2);
SetWriteHandler(0x8000,0xffff,Mapper40_write);
SetReadHandler(0x6000,0x7fff,CartBR);
MapIRQHook=Mapper40IRQ;
}