mirror of
https://github.com/dborth/fceugx.git
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79 lines
1.9 KiB
C
79 lines
1.9 KiB
C
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/* 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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#define suntoggle mapbyte1[0]
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static DECLFW(Mapper67_write)
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{
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A&=0xF800;
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if((A&0x800) && A<=0xb800)
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{
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VROM_BANK2((A-0x8800)>>1,V);
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}
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else switch(A)
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{
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case 0xc800:
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case 0xc000:if(!suntoggle)
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{
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IRQCount&=0xFF;
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IRQCount|=V<<8;
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}
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else
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{
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IRQCount&=0xFF00;
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IRQCount|=V;
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}
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suntoggle^=1;
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break;
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case 0xd800:suntoggle=0;IRQa=V&0x10;X6502_IRQEnd(FCEU_IQEXT);break;
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case 0xe800:switch(V&3)
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{
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case 0:MIRROR_SET2(1);break;
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case 1:MIRROR_SET2(0);break;
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case 2:onemir(0);break;
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case 3:onemir(1);break;
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}
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break;
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case 0xf800:ROM_BANK16(0x8000,V);break;
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}
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}
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static void FP_FASTAPASS(1) SunIRQHook(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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void Mapper67_init(void)
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{
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SetWriteHandler(0x8000,0xffff,Mapper67_write);
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MapIRQHook=SunIRQHook;
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}
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