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