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Viewing changes to fceu/src/boards/ks7032.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/ks7032.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[8], cmd, IRQa;
 
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static int32 IRQCount;
 
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static SFORMAT StateRegs[]=
 
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{
 
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  {&cmd, 1, "CMD"},
 
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  {reg, 8, "REGS"},
 
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  {&IRQa, 1, "IRQA"},
 
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  {&IRQCount, 4, "IRQC"},
 
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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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  setprg8(0x6000,reg[4]);
 
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  setprg8(0x8000,reg[1]);
 
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  setprg8(0xA000,reg[2]);
 
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  setprg8(0xC000,reg[3]);
 
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  setprg8(0xE000,~0);
 
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  setchr8(0);
 
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}
 
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static DECLFW(UNLKS7032Write)
 
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{
 
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//  FCEU_printf("bs %04x %02x\n",A,V);
 
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  switch(A)
 
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  {
 
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//    case 0x8FFF: reg[4]=V; Sync(); break;
 
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    case 0x8000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0x000F)|(V&0x0F); break;
 
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    case 0x9000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0x00F0)|((V&0x0F)<<4); break;
 
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    case 0xA000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0x0F00)|((V&0x0F)<<8); break;
 
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    case 0xB000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0xF000)|(V<<12); break;
 
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    case 0xC000: X6502_IRQEnd(FCEU_IQEXT); IRQa=1; break;
 
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    case 0xE000: cmd=V&7; break;
 
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    case 0xF000: reg[cmd]=V; Sync(); break;
 
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  }
 
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}
 
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static void UNLSMB2JIRQHook(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>=0xFFFF)
 
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    {
 
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      IRQa=0;
 
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      IRQCount=0;
 
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      X6502_IRQBegin(FCEU_IQEXT);
 
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    }
 
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  }
 
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}
 
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static void UNLKS7032Power(void)
 
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{
 
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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(0x4020,0xFFFF,UNLKS7032Write);
 
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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 UNLKS7032_Init(CartInfo *info)
 
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{
 
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  info->Power=UNLKS7032Power;
 
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  MapIRQHook=UNLSMB2JIRQHook;
 
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  GameStateRestore=StateRestore;
 
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  AddExState(&StateRegs, ~0, 0, 0);
 
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}