/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2007 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "mapinc.h"

static uint8 reg, delay, mirr;

static SFORMAT StateRegs[]=
{
  {&reg, 1, "REG"},
  {&mirr, 1, "MIRR"},
  {0}
};

static void Sync(void)
{
  setchr8(reg);
  if(!delay)
  {
  setprg16(0x8000,reg);
  setprg8(0xC000,reg << 1);
  }
  setprg8(0xE000,(reg << 1) + 1);
  setmirror(((mirr&4)>>2)^1);
}

static DECLFW(M175Write1)
{
  mirr = V;
  delay = 1;
  Sync();
}

static DECLFW(M175Write2)
{
  reg = V & 0x0F;
  delay = 1;
  Sync();
}

static DECLFR(M175Read)
{
  if(A==0xFFFC)
  {
    delay = 0;
    Sync();
  }
  return CartBR(A);
}

static void M175Power(void)
{
  reg = mirr = delay = 0;
  SetReadHandler(0x8000,0xFFFF,M175Read);
  SetWriteHandler(0x8000,0x8000,M175Write1);
  SetWriteHandler(0xA000,0xA000,M175Write2);
  Sync();     
}

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

void Mapper175_Init(CartInfo *info)
{
  info->Power=M175Power;
  GameStateRestore=StateRestore;

  AddExState(&StateRegs, ~0, 0, 0);
}