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Viewing changes to fceu/src/mappers/42.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/42.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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static DECLFW(Mapper42_write)
 
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{
 
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// FCEU_printf("%04x:%04x\n",A,V);
 
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 switch(A&0xe003)
 
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 {
 
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  case 0x8000:VROM_BANK8(V);break;
 
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  case 0xe000:mapbyte1[0]=V;ROM_BANK8(0x6000,V&0xF);break;
 
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  case 0xe001:MIRROR_SET((V>>3)&1);break;
 
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  case 0xe002:IRQa=V&2;if(!IRQa) IRQCount=0;X6502_IRQEnd(FCEU_IQEXT);break;
 
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 }
 
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}
 
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static void Mapper42IRQ(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>=32768) IRQCount-=32768;
 
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        if(IRQCount>=24576)
 
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         X6502_IRQBegin(FCEU_IQEXT);
 
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        else
 
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         X6502_IRQEnd(FCEU_IQEXT);
 
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 }
 
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}
 
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static void Mapper42_StateRestore(int version)
 
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{
 
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    ROM_BANK8(0x6000,mapbyte1[0]&0xF);
 
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}
 
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void Mapper42_init(void)
 
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{
 
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  ROM_BANK8(0x6000,0);
 
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  ROM_BANK32(~0);
 
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  SetWriteHandler(0x6000,0xffff,Mapper42_write);
 
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  SetReadHandler(0x6000,0x7fff,CartBR);
 
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  MapStateRestore=Mapper42_StateRestore;
 
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  MapIRQHook=Mapper42IRQ;
 
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}
 
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