/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2005 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
 *
 * Family Study Box by Fukutake Shoten
 */

#include "mapinc.h"

static uint8 SWRAM[2816];
static uint8 *WRAM=NULL;
static uint8 regs[4];

static SFORMAT StateRegs[]=
{
  {regs, 4, "DREG"},
  {SWRAM, 2816, "SWRAM"},
  {0}
};

static void Sync(void)
{
  setprg8r(0x10,0x6000,regs[0]>>6);
  setprg16(0x8000,regs[1]);
  setprg16(0xc000,0);
}

static DECLFW(M186Write)
{
  if(A&0x4203) regs[A&3]=V;
  Sync();
}

static DECLFR(M186Read)
{
  switch(A)
  {
    case 0x4200: return 0x00; break;
    case 0x4201: return 0x00; break;
    case 0x4202: return 0x40; break;
    case 0x4203: return 0x00; break;
  }
  return 0xFF;
}

static DECLFR(ASWRAM)
{
  return(SWRAM[A-0x4400]);
}
static DECLFW(BSWRAM)
{
  SWRAM[A-0x4400]=V;
}

static void M186Power(void)
{
  setchr8(0);
  SetReadHandler(0x6000,0xFFFF,CartBR);
  SetWriteHandler(0x6000,0xFFFF,CartBW);
  SetReadHandler(0x4200,0x43FF,M186Read);
  SetWriteHandler(0x4200,0x43FF,M186Write);
  SetReadHandler(0x4400,0x4EFF,ASWRAM);
  SetWriteHandler(0x4400,0x4EFF,BSWRAM);
  regs[0]=regs[1]=regs[2]=regs[3];
  Sync();
}

static void M186Close(void)
{
  if(WRAM)
    FCEU_gfree(WRAM);
  WRAM=NULL;
}

static void M186Restore(int version)
{
  Sync();
}

void Mapper186_Init(CartInfo *info)
{
  info->Power=M186Power;
  info->Close=M186Close;
  GameStateRestore=M186Restore;
  WRAM=(uint8*)FCEU_gmalloc(32768);
  SetupCartPRGMapping(0x10,WRAM,32768,1);
  AddExState(WRAM, 32768, 0, "WRAM");
  AddExState(StateRegs, ~0, 0, 0);
}
