mappers/65.c

   1 /* FCE Ultra - NES/Famicom Emulator
   2  *
   3  * Copyright notice for this file:
   4  *  Copyright (C) 2002 Ben Parnell
   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 void FP_FASTAPASS(1) IREMIRQHook(int a)
  25 {
  26   if(IRQa)
  27   {
  28    IRQCount-=a;
  29    if(IRQCount<=0-4)
  30    {
  31     TriggerIRQ();
  32     IRQa=0;
  33     IRQCount=0xFFFF;
  34    }
  35   }
  36 }
  37
  38 DECLFW(Mapper65_write)
  39 {
  40 switch(A)
  41 {
  42 case 0x8000:ROM_BANK8(0x8000,V);break;
  43 case 0x9000:MIRROR_SET2((V>>6)&1);break;
  44 case 0x9003:IRQa=V&0x80;break;
  45 case 0x9004:IRQCount=IRQLatch;break;
  46 case 0x9005:          IRQLatch&=0x00FF;
  47                       IRQLatch|=V<<8;
  48                       break;
  49 case 0x9006:          IRQLatch&=0xFF00;IRQLatch|=V;
  50                       break;
  51 case 0xB000:VROM_BANK1(0x0000,V);break;
  52 case 0xB001:VROM_BANK1(0x0400,V);break;
  53 case 0xB002:VROM_BANK1(0x0800,V);break;
  54 case 0xB003:VROM_BANK1(0x0C00,V);break;
  55 case 0xB004:VROM_BANK1(0x1000,V);break;
  56 case 0xB005:VROM_BANK1(0x1400,V);break;
  57 case 0xB006:VROM_BANK1(0x1800,V);break;
  58 case 0xB007:VROM_BANK1(0x1C00,V);break;
  59 case 0xa000:ROM_BANK8(0xA000,V);break;
  60 case 0xC000:ROM_BANK8(0xC000,V);break;
  61  }
  62 }
  63
  64 void Mapper65_init(void)
  65 {
  66  MapIRQHook=IREMIRQHook;
  67  SetWriteHandler(0x8000,0xffff,Mapper65_write);
  68 }