merge mapper code from FCEUX

[fceu.git] / boards / 235.c

/* FCE Ultra - NES/Famicom Emulator\r
 *\r
 * Copyright notice for this file:\r
 *  Copyright (C) 2005 CaH4e3\r
 *\r
 * This program is free software; you can redistribute it and/or modify\r
 * it under the terms of the GNU General Public License as published by\r
 * the Free Software Foundation; either version 2 of the License, or\r
 * (at your option) any later version.\r
 *\r
 * This program is distributed in the hope that it will be useful,\r
 * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
 * GNU General Public License for more details.\r
 *\r
 * You should have received a copy of the GNU General Public License\r
 * along with this program; if not, write to the Free Software\r
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint16 cmdreg;\r
static SFORMAT StateRegs[]=\r
{\r
  {&cmdreg, 2, "CMDREG"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  if(cmdreg&0x400)\r
    setmirror(MI_0);\r
  else\r
    setmirror(((cmdreg>>13)&1)^1);\r
  if(cmdreg&0x800)\r
  {\r
    setprg16(0x8000,((cmdreg&0x300)>>3)|((cmdreg&0x1F)<<1)|((cmdreg>>12)&1));\r
    setprg16(0xC000,((cmdreg&0x300)>>3)|((cmdreg&0x1F)<<1)|((cmdreg>>12)&1));\r
  }\r
  else\r
    setprg32(0x8000,((cmdreg&0x300)>>4)|(cmdreg&0x1F));\r
}\r
\r
static DECLFW(M235Write)\r
{\r
  cmdreg=A;\r
  Sync();\r
}\r
\r
static void M235Power(void)\r
{\r
  setchr8(0);\r
  SetWriteHandler(0x8000,0xFFFF,M235Write);\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
  cmdreg=0;\r
  Sync();\r
}\r
\r
static void M235Restore(int version)\r
{\r
  Sync();\r
}\r
\r
void Mapper235_Init(CartInfo *info)\r
{\r
  info->Power=M235Power;\r
  GameStateRestore=M235Restore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r