merge mappers from FCEU-mm

[fceu.git] / boards / 8157.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint16 cmdreg;\r
static uint8 invalid_data;\r
static SFORMAT StateRegs[]=\r
{\r
  {&invalid_data, 1, "INVD"},  \r
  {&cmdreg, 2, "CREG"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  setprg16r((cmdreg&0x060)>>5,0x8000,(cmdreg&0x01C)>>2);\r
  setprg16r((cmdreg&0x060)>>5,0xC000,(cmdreg&0x200)?(~0):0);\r
  setmirror(((cmdreg&2)>>1)^1);\r
}\r
\r
static DECLFR(UNL8157Read)\r
{\r
  if(invalid_data&&cmdreg&0x100)\r
    return 0xFF;\r
  else\r
    return CartBR(A);\r
}\r
\r
static DECLFW(UNL8157Write)\r
{\r
  cmdreg=A;\r
  Sync();\r
}\r
\r
static void UNL8157Power(void)\r
{\r
  setchr8(0);\r
  SetWriteHandler(0x8000,0xFFFF,UNL8157Write);\r
  SetReadHandler(0x8000,0xFFFF,UNL8157Read);\r
  cmdreg=0x200;\r
  invalid_data=1;\r
  Sync();\r
}\r
\r
static void UNL8157Reset(void)\r
{\r
  cmdreg=0;\r
  invalid_data^=1;\r
  Sync();\r
}\r
\r
static void UNL8157Restore(int version)\r
{\r
  Sync();\r
}\r
\r
void UNL8157_Init(CartInfo *info)\r
{\r
  info->Power=UNL8157Power;\r
  info->Reset=UNL8157Reset;\r
  GameStateRestore=UNL8157Restore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r