merge mapper code from FCEUX

[fceu.git] / boards / 175.c

/* FCE Ultra - NES/Famicom Emulator\r
 *\r
 * Copyright notice for this file:\r
 *  Copyright (C) 2007 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 uint8 reg, delay, mirr;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {&reg, 1, "REG"},\r
  {&mirr, 1, "MIRR"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  setchr8(reg);\r
  if(!delay)\r
  {\r
  setprg16(0x8000,reg);\r
  setprg8(0xC000,reg << 1);\r
  }\r
  setprg8(0xE000,(reg << 1) + 1);\r
  setmirror(((mirr&4)>>2)^1);\r
}\r
\r
static DECLFW(M175Write1)\r
{\r
  mirr = V;\r
  delay = 1;\r
  Sync();\r
}\r
\r
static DECLFW(M175Write2)\r
{\r
  reg = V & 0x0F;\r
  delay = 1;\r
  Sync();\r
}\r
\r
static DECLFR(M175Read)\r
{\r
  if(A==0xFFFC)\r
  {\r
    delay = 0;\r
    Sync();\r
  }\r
  return CartBR(A);\r
}\r
\r
static void M175Power(void)\r
{\r
  reg = mirr = delay = 0;\r
  SetReadHandler(0x8000,0xFFFF,M175Read);\r
  SetWriteHandler(0x8000,0x8000,M175Write1);\r
  SetWriteHandler(0xA000,0xA000,M175Write2);\r
  Sync();     \r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
void Mapper175_Init(CartInfo *info)\r
{\r
  info->Power=M175Power;\r
  GameStateRestore=StateRestore;\r
\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r