fceugx/source/fceultra/boards/156.cpp

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2009 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 uint8 chrlo[8], chrhi[8], prg, mirr, mirrisused = 0;
static uint8 *WRAM=NULL;
static uint32 WRAMSIZE;

static SFORMAT StateRegs[]=
{
  {&prg, 1, "PREG"},
  {chrlo, 8, "CRGL"},
  {chrhi, 8, "CRGH"},
  {&mirr, 1, "MIRR"},
  {0}
};

static void Sync(void)
{
  uint32 i;
  for(i=0; i<8; i++)
    setchr1(i<<10, chrlo[i]|(chrhi[i] << 8));
  setprg8r(0x10,0x6000,0);
  setprg16(0x8000,prg);
  setprg16(0xC000,~0);
  if(mirrisused)
    setmirror(mirr ^ 1);
  else
    setmirror(MI_0);
}

static DECLFW(M156Write)
{
  switch(A) {
   case 0xC000:
   case 0xC001:
   case 0xC002:
   case 0xC003: chrlo[A&3] = V; Sync(); break;
   case 0xC004:
   case 0xC005:
   case 0xC006:
   case 0xC007: chrhi[A&3] = V; Sync(); break;
   case 0xC008:
   case 0xC009:
   case 0xC00A:
   case 0xC00B: chrlo[4+(A&3)] = V; Sync(); break;
   case 0xC00C:
   case 0xC00D:
   case 0xC00E:
   case 0xC00F: chrhi[4+(A&3)] = V; Sync(); break;
   case 0xC010: prg = V; Sync(); break;
   case 0xC014: mirr = V; mirrisused = 1; Sync(); break;
  }
}

static void M156Reset(void)
{
  uint32 i;
  for(i=0;i<8;i++)
  {
    chrlo[i]=0;
    chrhi[i]=0;
  }
  prg=0;
  mirr=0;
  mirrisused = 0;
}

static void M156Power(void)
{
  M156Reset();
  Sync();
  SetReadHandler(0x6000,0xFFFF,CartBR);
  SetWriteHandler(0x6000,0x7FFF,CartBW);
  SetWriteHandler(0xC000,0xCFFF,M156Write);
}

static void M156Close(void)
{
  if(WRAM)
    FCEU_gfree(WRAM);
  WRAM=NULL;
}

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

void Mapper156_Init(CartInfo *info)
{
  info->Power=M156Reset;
  info->Power=M156Power;
  info->Close=M156Close;

  WRAMSIZE=8192;
  WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);
  SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);
  AddExState(WRAM, WRAMSIZE, 0, "WRAM");

  GameStateRestore=StateRestore;
  AddExState(&StateRegs, ~0, 0, 0);
}