fceugx/source/fceultra/boards/t-262.cpp

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2006 CaH4e3
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "mapinc.h"

static uint16 addrreg;
static uint8 datareg;
static uint8 busy;
static SFORMAT StateRegs[]=
{
  {&addrreg, 2, "AREG"},
  {&datareg, 1, "DREG"},
  {&busy, 1, "BUSY"},
  {0}
};

static void Sync(void)
{
  uint16 base=((addrreg&0x60)>>2)|((addrreg&0x100)>>3);
  setprg16(0x8000,(datareg&7)|base);
  setprg16(0xC000,7|base);
  setmirror(((addrreg&2)>>1)^1);
}

static DECLFW(BMCT262Write)
{
  if(busy||(A==0x8000))
    datareg=V;
  else
  {
    addrreg=A;
    busy=1;
  }
  Sync();
}

static void BMCT262Power(void)
{
  setchr8(0);
  SetWriteHandler(0x8000,0xFFFF,BMCT262Write);
  SetReadHandler(0x8000,0xFFFF,CartBR);
  busy=0;
  addrreg=0;
  datareg=0xff;
  Sync();
}

static void BMCT262Reset(void)
{
  busy=0;
  addrreg=0;
  datareg=0;
  Sync();
}

static void BMCT262Restore(int version)
{
  Sync();
}

void BMCT262_Init(CartInfo *info)
{
  info->Power=BMCT262Power;
  info->Reset=BMCT262Reset;
  GameStateRestore=BMCT262Restore;
  AddExState(&StateRegs, ~0, 0, 0);
}