fceux/mappers/17.c

74 lines
2.1 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 void FP_FASTAPASS(1) FFEIRQHook(int a)
{
if(IRQa)
{
IRQCount+=a;
if(IRQCount>=0x10000)
{
X6502_IRQBegin(FCEU_IQEXT);
IRQa=0;
IRQCount=0;
}
}
}
DECLFW(Mapper17_write)
{
switch(A){
default:
break;
case 0x42FE:
onemir((V>>4)&1);
break;
case 0x42FF:
MIRROR_SET((V>>4)&1);
break;
case 0x4501:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;
case 0x4502:IRQCount&=0xFF00;IRQCount|=V;break;
case 0x4503:IRQCount&=0x00FF;IRQCount|=V<<8;IRQa=1;break;
case 0x4504: ROM_BANK8(0x8000,V);break;
case 0x4505: ROM_BANK8(0xA000,V);break;
case 0x4506: ROM_BANK8(0xC000,V);break;
case 0x4507: ROM_BANK8(0xE000,V);break;
case 0x4510: VROM_BANK1(0x0000,V);break;
case 0x4511: VROM_BANK1(0x0400,V);break;
case 0x4512: VROM_BANK1(0x0800,V);break;
case 0x4513: VROM_BANK1(0x0C00,V);break;
case 0x4514: VROM_BANK1(0x1000,V);break;
case 0x4515: VROM_BANK1(0x1400,V);break;
case 0x4516: VROM_BANK1(0x1800,V);break;
case 0x4517: VROM_BANK1(0x1C00,V);break;
}
}
void Mapper17_init(void)
{
MapIRQHook=FFEIRQHook;
SetWriteHandler(0x4020,0x5fff,Mapper17_write);
}