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Viewing changes to fceu/src/boards/106.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/boards/106.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) 2007 CaH4e3
 
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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 uint8 reg[16], IRQa;
 
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static uint32 IRQCount;
 
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static uint8 *WRAM=NULL;
 
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static uint32 WRAMSIZE;
 
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static SFORMAT StateRegs[]=
 
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{
 
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  {&IRQa, 1, "IRQA"},
 
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  {&IRQCount, 4, "IRQCOUNT"},
 
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  {reg, 16, "REGS"},
 
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  {0}
 
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};
 
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static void Sync(void)
 
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{
 
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  setchr1(0x0000,reg[0]&0xfe);
 
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  setchr1(0x0400,reg[1]|1);
 
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  setchr1(0x0800,reg[2]&0xfe);
 
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  setchr1(0x0c00,reg[3]|1);
 
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  setchr1(0x1000,reg[4]);
 
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  setchr1(0x1400,reg[5]);
 
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  setchr1(0x1800,reg[6]);
 
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  setchr1(0x1c00,reg[7]);
 
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  setprg8r(0x10,0x6000,0);
 
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  setprg8(0x8000,(reg[0x8]&0xf)|0x10);
 
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  setprg8(0xA000,(reg[0x9]&0x1f));
 
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  setprg8(0xC000,(reg[0xa]&0x1f));
 
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  setprg8(0xE000,(reg[0xb]&0xf)|0x10);
 
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  setmirror((reg[0xc]&1)^1);
 
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}
 
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static DECLFW(M106Write)
 
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{
 
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  A&=0xF;
 
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  switch(A)
 
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  {
 
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    case 0xD: IRQa=0; IRQCount=0; X6502_IRQEnd(FCEU_IQEXT); break;
 
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    case 0xE: IRQCount=(IRQCount&0xFF00)|V; break;
 
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    case 0xF: IRQCount=(IRQCount&0x00FF)|(V<<8); IRQa=1; break;
 
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    default: reg[A]=V; Sync(); break;
 
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  }
 
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}
 
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static void M106Power(void)
 
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{
 
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  reg[8]=reg[9]=reg[0xa]=reg[0xb]=-1;
 
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  Sync();
 
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  SetReadHandler(0x6000,0x7FFF,CartBR);
 
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  SetReadHandler(0x8000,0xFFFF,CartBR);
 
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  SetWriteHandler(0x6000,0x7FFF,CartBW);
 
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  SetWriteHandler(0x8000,0xFFFF,M106Write);
 
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}
 
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static void M106Reset(void)
 
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{
 
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}
 
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static void M106Close(void)
 
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{
 
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  if(WRAM)
 
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    FCEU_gfree(WRAM);
 
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  WRAM=NULL;
 
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}
 
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void M106CpuHook(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>0x10000)
 
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    {
 
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      X6502_IRQBegin(FCEU_IQEXT);
 
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      IRQa=0;
 
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    }
 
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  }
 
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}
 
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static void StateRestore(int version)
 
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{
 
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  Sync();
 
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}
 
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void Mapper106_Init(CartInfo *info)
 
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{
 
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  info->Reset=M106Reset;
 
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  info->Power=M106Power;
 
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  info->Close=M106Close;
 
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  MapIRQHook=M106CpuHook;
 
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  GameStateRestore=StateRestore;
 
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  WRAMSIZE=8192;
 
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  WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);
 
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  SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);
 
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  AddExState(WRAM, WRAMSIZE, 0, "WRAM");
 
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  AddExState(&StateRegs, ~0, 0, 0);
 
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}