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https://github.com/dborth/fceugx.git
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81 lines
2.1 KiB
C
81 lines
2.1 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 K4buf mapbyte2
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#define K4buf2 mapbyte3
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void FP_FASTAPASS(1) JalecoIRQHook(int a)
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{
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if(IRQa && IRQCount)
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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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IRQCount=0;
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IRQa=0;
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}
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}
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}
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DECLFW(Mapper18_write)
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{
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A&=0xF003;
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if(A>=0x8000 && A<=0x9001)
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{
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int x=((A>>1)&1)|((A-0x8000)>>11);
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K4buf2[x]&=(0xF0)>>((A&1)<<2);
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K4buf2[x]|=(V&0xF)<<((A&1)<<2);
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ROM_BANK8(0x8000+(x<<13),K4buf2[x]);
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}
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else if(A>=0xa000 && A<=0xd003)
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{
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int x=((A>>1)&1)|((A-0xA000)>>11);
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K4buf[x]&=(0xF0)>>((A&1)<<2);
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K4buf[x]|=(V&0xF)<<((A&1)<<2);
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VROM_BANK1(x<<10,K4buf[x]);
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}
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else switch(A)
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{
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case 0xe000:IRQLatch&=0xFFF0;IRQLatch|=(V&0x0f);break;
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case 0xe001:IRQLatch&=0xFF0F;IRQLatch|=(V&0x0f)<<4;break;
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case 0xe002:IRQLatch&=0xF0FF;IRQLatch|=(V&0x0f)<<8;break;
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case 0xe003:IRQLatch&=0x0FFF;IRQLatch|=(V&0x0f)<<12;break;
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case 0xf000:IRQCount=IRQLatch;
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break;
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case 0xf001:IRQa=V&1;
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X6502_IRQEnd(FCEU_IQEXT);
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break;
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case 0xf002:MIRROR_SET2(V&1);
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if(V&2) onemir(0);
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break;
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}
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}
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void Mapper18_init(void)
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{
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SetWriteHandler(0x8000,0xffff,Mapper18_write);
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MapIRQHook=JalecoIRQHook;
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}
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