61 lines
1.6 KiB
C++
61 lines
1.6 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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static DECLFW(Mapper73_write)
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{
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//if(A>=0xd000 && A<=0xdfff)
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X6502_IRQEnd(FCEU_IQEXT); /* How are IRQs acknowledged on this chip? */
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switch(A&0xF000)
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{
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//default: printf("$%04x:$%02x\n",A,V);break;
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case 0x8000:IRQCount&=0xFFF0;IRQCount|=(V&0xF);break;
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case 0x9000:IRQCount&=0xFF0F;IRQCount|=(V&0xF)<<4;break;
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case 0xa000:IRQCount&=0xF0FF;IRQCount|=(V&0xF)<<8;break;
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case 0xb000:IRQCount&=0x0FFF;IRQCount|=(V&0xF)<<12;break;
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case 0xc000:IRQa=V&2;break;
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case 0xf000:ROM_BANK16(0x8000,V);break;
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}
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}
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static void FP_FASTAPASS(1) Mapper73IRQHook(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>=0xFFFF)
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{
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IRQCount&=0xFFFF;
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IRQa=0;
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X6502_IRQBegin(FCEU_IQEXT);
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}
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}
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}
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void Mapper73_init(void)
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{
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SetWriteHandler(0x8000,0xffff,Mapper73_write);
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MapIRQHook=Mapper73IRQHook;
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}
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