merge mapper code from FCEUX

[fceu.git] / boards / 57.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
\r
#include "mapinc.h"\r
\r
static uint8 prg_reg;\r
static uint8 chr_reg;\r
static uint8 hrd_flag;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {&hrd_flag, 1, "DIPSW"},\r
  {&prg_reg, 1, "PRG"},\r
  {&chr_reg, 1, "CHR"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  if(prg_reg&0x80)\r
    setprg32(0x8000,prg_reg>>6);\r
  else\r
  {\r
    setprg16(0x8000,(prg_reg>>5)&3);\r
    setprg16(0xC000,(prg_reg>>5)&3);\r
  }\r
  setmirror((prg_reg&8)>>3);\r
  setchr8((chr_reg&3)|(prg_reg&7)|((prg_reg&0x10)>>1));\r
}\r
\r
static DECLFR(M57Read)\r
{\r
  return hrd_flag;\r
}\r
\r
static DECLFW(M57Write)\r
{\r
  if((A&0x8800)==0x8800)\r
    prg_reg=V;\r
  else\r
    chr_reg=V;\r
  Sync();\r
}\r
\r
static void M57Power(void)\r
{\r
  prg_reg=0;\r
  chr_reg=0;\r
  hrd_flag=0;\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
  SetWriteHandler(0x8000,0xFFFF,M57Write);\r
  SetReadHandler(0x6000,0x6000,M57Read);\r
  Sync();\r
}\r
\r
static void M57Reset()\r
{\r
  hrd_flag++;\r
  hrd_flag&=3;\r
  FCEU_printf("Select Register = %02x\n",hrd_flag);\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
void Mapper57_Init(CartInfo *info)\r
{\r
  info->Power=M57Power;\r
  info->Reset=M57Reset;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r