merge mapper code from FCEUX

[fceu.git] / boards / bs-5.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_prg[4];\r
static uint8 reg_chr[4];\r
static uint8 dip_switch;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {reg_prg, 4, "PREGS"},\r
  {reg_chr, 4, "CREGS"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  setprg8(0x8000,reg_prg[0]);\r
  setprg8(0xa000,reg_prg[1]);\r
  setprg8(0xc000,reg_prg[2]);\r
  setprg8(0xe000,reg_prg[3]);\r
  setchr2(0x0000,reg_chr[0]);\r
  setchr2(0x0800,reg_chr[1]);\r
  setchr2(0x1000,reg_chr[2]);\r
  setchr2(0x1800,reg_chr[3]);\r
  setmirror(MI_V);\r
}\r
\r
static DECLFW(MBS5Write)\r
{\r
  int bank_sel = (A&0xC00)>>10;\r
  switch (A&0xF000)\r
  {\r
    case 0x8000:\r
         reg_chr[bank_sel]=A&0x1F;\r
         break;\r
    case 0xA000:\r
         if(A&(1<<(dip_switch+4)))\r
          reg_prg[bank_sel]=A&0x0F;\r
         break;\r
  }\r
  Sync();\r
}\r
\r
static void MBS5Reset(void)\r
{\r
  dip_switch++;\r
  dip_switch&=3;\r
  reg_prg[0]=reg_prg[1]=reg_prg[2]=reg_prg[3]=~0;     \r
  Sync();\r
}\r
\r
static void MBS5Power(void)\r
{\r
  dip_switch=0;\r
  reg_prg[0]=reg_prg[1]=reg_prg[2]=reg_prg[3]=~0;     \r
  Sync();\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
  SetWriteHandler(0x8000,0xFFFF,MBS5Write);\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
void BMCBS5_Init(CartInfo *info)\r
{\r
  info->Power=MBS5Power;\r
  info->Reset=MBS5Reset;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r