mappers/117.c

   1 /* FCE Ultra - NES/Famicom Emulator
   2  *
   3  * Copyright notice for this file:
   4  *  Copyright (C) 2002 Xodnizel
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "mapinc.h"
  22
  23
  24
  25 DECLFW(Mapper117_write)
  26 {
  27  //if(A>=0xc000)
  28  //printf("$%04x:$%02x, %d,%d\n",A,V,scanline,timestamp);
  29  switch(A)
  30  {
  31   case 0xc001:IRQLatch=V;break;
  32   case 0xc003:IRQCount=IRQLatch;IRQa|=2;break;
  33   case 0xe000:IRQa&=~1;IRQa|=V&1;X6502_IRQEnd(FCEU_IQEXT);break;
  34   case 0xc002:X6502_IRQEnd(FCEU_IQEXT);break;
  35   case 0xa000:VROM_BANK1(0x0000,V);break;
  36   case 0xa001:VROM_BANK1(0x0400,V);break;
  37   case 0xa002:VROM_BANK1(0x0800,V);break;
  38   case 0xa003:VROM_BANK1(0x0c00,V);break;
  39   case 0xa004:VROM_BANK1(0x1000,V);break;
  40   case 0xa005:VROM_BANK1(0x1400,V);break;
  41   case 0xa006:VROM_BANK1(0x1800,V);break;
  42   case 0xa007:VROM_BANK1(0x1c00,V);break;
  43   case 0x8000:ROM_BANK8(0x8000,V);break;
  44   case 0x8001:ROM_BANK8(0xa000,V);break;
  45   case 0x8002:ROM_BANK8(0xc000,V);break;
  46   case 0x8003:ROM_BANK8(0xe000,V);break;
  47  }
  48 }
  49
  50 static void Mapper117_hb(void)
  51 {
  52  //if(scanline==0x40) X6502_IRQBegin(FCEU_IQEXT);
  53  //return;
  54  if(IRQa==3 && IRQCount)
  55  {
  56   IRQCount--;
  57   if(!IRQCount)
  58   {
  59    IRQa&=1;
  60    X6502_IRQBegin(FCEU_IQEXT);
  61   }
  62  }
  63 }
  64
  65 void Mapper117_init(void)
  66 {
  67   GameHBIRQHook=Mapper117_hb;
  68   SetWriteHandler(0x8000,0xffff,Mapper117_write);
  69 }
  70