merge mapper code from FCEUX

[fceu.git] / boards / 43.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
 */\r
\r
//ccording to nestopia, BTL_SMB2_C, otherwise known as UNL-SMB2J\r
\r
#include "mapinc.h"\r
\r
static uint8 reg;\r
static uint8 IRQa;\r
static uint32 IRQCount;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {&IRQCount, 4, "IRQC"},\r
  {&IRQa, 1, "IRQA"},\r
  {&reg, 1, "REG"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  setprg4(0x5000,16);  \r
  setprg8(0x6000,2);\r
  setprg8(0x8000,1);\r
  setprg8(0xa000,0);\r
  setprg8(0xc000,reg);\r
  setprg8(0xe000,9);\r
  setchr8(0);\r
}\r
\r
static DECLFW(M43Write)\r
{\r
  int transo[8]={4,3,4,4,4,7,5,6};\r
  switch(A&0xf1ff)\r
  {\r
    case 0x4022: reg=transo[V&7]; Sync(); break;\r
    case 0x8122: IRQa=V&1; IRQCount=0; break;\r
  }\r
}\r
\r
static void M43Power(void)\r
{\r
  reg=0;\r
  Sync();\r
//  SetReadHandler(0x5000,0x5fff,CartBR);\r
  SetReadHandler(0x5000,0xffff,CartBR);\r
  SetWriteHandler(0x4020,0xffff,M43Write);\r
}\r
\r
static void M43Reset(void)\r
{\r
}\r
\r
static void M43IRQHook(int a)\r
{\r
 IRQCount+=a;\r
 if(IRQa)\r
  if(IRQCount>=4096)\r
  {\r
   IRQa=0;\r
   X6502_IRQBegin(FCEU_IQEXT);\r
  }\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
void Mapper43_Init(CartInfo *info)\r
{\r
  info->Reset=M43Reset;\r
  info->Power=M43Power;\r
  MapIRQHook=M43IRQHook;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r