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Viewing changes to fceu/src/mappers/18.cpp

  • Committer: Bazaar Package Importer
  • Author(s): Fabrice Coutadeur
  • Date: 2009-12-14 08:05:17 UTC
  • Revision ID: james.westby@ubuntu.com-20091214080517-abi5tj8avthfan7c
Tags: upstream-2.1.2+repack
Import upstream version 2.1.2+repack

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fceu/src/mappers/18.cpp
 
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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 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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}