merge mapper code from FCEUX

[fceu.git] / boards / 01-222.c

/* FCE Ultra - NES/Famicom Emulator\r
 *\r
 * Copyright notice for this file:\r
 *  Copyright (C) 2006 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
 * TXC mappers\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint8 reg[4], cmd, is172, is173;\r
static SFORMAT StateRegs[]=\r
{\r
  {reg, 4, "REGS"},\r
  {&cmd, 1, "CMD"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  setprg32(0x8000,(reg[2]>>2)&1);\r
  if(is172)\r
    setchr8((((cmd^reg[2])>>3)&2)|(((cmd^reg[2])>>5)&1)); // 1991 DU MA Racing probably CHR bank sequence is WRONG, so it is possible to\r
                                                          // rearrange CHR banks for normal UNIF board and mapper 172 is unneccessary\r
  else\r
    setchr8(reg[2]&3);\r
}\r
\r
static DECLFW(UNL22211WriteLo)\r
{\r
//  FCEU_printf("bs %04x %02x\n",A,V);\r
  reg[A&3]=V;\r
}\r
\r
static DECLFW(UNL22211WriteHi)\r
{\r
//  FCEU_printf("bs %04x %02x\n",A,V);\r
  cmd=V;\r
  Sync();\r
}\r
\r
static DECLFR(UNL22211ReadLo)\r
{\r
    return (reg[1]^reg[2])|(is173?0x01:0x40);\r
//  if(reg[3])\r
//    return reg[2];\r
//  else\r
//    return X.DB;\r
}\r
\r
static void UNL22211Power(void)\r
{\r
  Sync();\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
  SetReadHandler(0x4100,0x4100,UNL22211ReadLo);\r
  SetWriteHandler(0x4100,0x4103,UNL22211WriteLo);\r
  SetWriteHandler(0x8000,0xFFFF,UNL22211WriteHi);\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
void UNL22211_Init(CartInfo *info)\r
{\r
  is172=0;\r
  is173=0;\r
  info->Power=UNL22211Power;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r
\r
void Mapper172_Init(CartInfo *info)\r
{\r
  is172=1;  \r
  is173=0;\r
  info->Power=UNL22211Power;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r
\r
void Mapper173_Init(CartInfo *info)\r
{\r
  is172=0;  \r
  is173=1;\r
  info->Power=UNL22211Power;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r