merge mapper code from FCEUX

[fceu.git] / boards / bmc42in1r.c

/* FCE Ultra - NES/Famicom Emulator\r
 *\r
 * Copyright notice for this file:\r
 *  Copyright (C) 2005 CaH4e3\r
 *  Copyright (C) 2009 qeed\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
 * BMC 42-in-1\r
 * it seems now, mapper not reset-based,\r
 * tested on real hardware and it does menus switch by pressing just Select, not Reset\r
 * new registers behaviour proven this too\r
 *\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint8 latche[2];\r
static SFORMAT StateRegs[]=\r
{\r
  {&latche, sizeof(latche), "LATCHE"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  uint8 bank = (latche[0]&0x1f)|((latche[0]&0x80)>>2)|((latche[1]&1))<<6;\r
  if(!(latche[0] & 0x20))\r
      setprg32(0x8000,bank >> 1);\r
  else\r
  {\r
      setprg16(0x8000,bank);\r
      setprg16(0xC000,bank);\r
  }\r
  setmirror((latche[0]>>6)&1);\r
  setchr8(0);\r
}\r
\r
static DECLFW(M226Write)\r
{\r
    latche[A & 1] = V;\r
    Sync();\r
}\r
\r
static void M226Power(void)\r
{\r
  latche[0] = latche[1] = 0;\r
  Sync();\r
  SetWriteHandler(0x8000,0xFFFF,M226Write);\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
void Mapper226_Init(CartInfo *info)\r
{\r
  info->Power=M226Power;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
  GameStateRestore=StateRestore;\r
}\r
\r