merge mappers from FCEU-mm

[fceu.git] / boards / smb2j.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
 *\r
 * FDS Conversions\r
 *\r
 * Super Mario Bros 2 J alt version\r
 * as well as "Voleyball" FDS conversion, bank layot is similar but no bankswitching and CHR ROM present\r
 *\r
 * mapper seems wrong researched by me ;( it should be mapper 43 modification\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint8 prg, IRQa;\r
static uint16 IRQCount;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {&prg, 1, "PRG"},\r
  {&IRQa, 1, "IRQA"},\r
  {&IRQCount, 2, "IRQC"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  setprg4r(1,0x5000,1);\r
  setprg8r(1,0x6000,1);\r
  setprg32(0x8000,prg);\r
  setchr8(0);\r
}\r
\r
static DECLFW(UNLSMB2JWrite)\r
{\r
  if(A==0x4022)\r
  {\r
    prg=V&1;\r
    Sync();\r
  }\r
  if(A==0x4122)\r
  {\r
    IRQa=V;\r
    IRQCount=0;\r
    X6502_IRQEnd(FCEU_IQEXT);\r
  }\r
}\r
\r
static void UNLSMB2JPower(void)\r
{\r
  prg=~0;\r
  Sync();\r
  SetReadHandler(0x5000,0x7FFF,CartBR);\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
  SetWriteHandler(0x4020,0xffff,UNLSMB2JWrite);\r
}\r
\r
static void UNLSMB2JReset(void)\r
{ \r
  prg=~0;\r
  Sync();\r
}\r
\r
static void FP_FASTAPASS(1) UNLSMB2JIRQHook(int a)\r
{\r
  if(IRQa)\r
  {\r
    IRQCount+=a*3;\r
    if((IRQCount>>12)==IRQa)\r
      X6502_IRQBegin(FCEU_IQEXT);\r
  }\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
void UNLSMB2J_Init(CartInfo *info)\r
{\r
  info->Reset=UNLSMB2JReset;\r
  info->Power=UNLSMB2JPower;\r
  MapIRQHook=UNLSMB2JIRQHook;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r