mappers/15.c

   1 /* FCE Ultra - NES/Famicom Emulator
   2  *
   3  * Copyright notice for this file:
   4  *  Copyright (C) 1998 BERO
   5  *  Copyright (C) 2002 Ben Parnell
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "mapinc.h"
  23
  24
  25
  26
  27 DECLFW(Mapper15_write)
  28 {
  29 switch(A)
  30  {
  31   case 0x8000:
  32         if(V&0x80)
  33         {
  34         ROM_BANK8(0x8000,(V<<1)+1);
  35         ROM_BANK8(0xA000,(V<<1));
  36         ROM_BANK8(0xC000,(V<<1)+2);
  37         ROM_BANK8(0xE000,(V<<1)+1);
  38         }
  39         else
  40         {
  41         ROM_BANK16(0x8000,V);
  42         ROM_BANK16(0xC000,V+1);
  43         }
  44         MIRROR_SET((V>>6)&1);
  45         break;
  46   case 0x8001:
  47         MIRROR_SET(0);
  48         ROM_BANK16(0x8000,V);
  49         ROM_BANK16(0xc000,~0);
  50         break;
  51   case 0x8002:
  52         if(V&0x80)
  53         {
  54          ROM_BANK8(0x8000,((V<<1)+1));
  55          ROM_BANK8(0xA000,((V<<1)+1));
  56          ROM_BANK8(0xC000,((V<<1)+1));
  57          ROM_BANK8(0xE000,((V<<1)+1));
  58         }
  59         else
  60         {
  61          ROM_BANK8(0x8000,(V<<1));
  62          ROM_BANK8(0xA000,(V<<1));
  63          ROM_BANK8(0xC000,(V<<1));
  64          ROM_BANK8(0xE000,(V<<1));
  65         }
  66         break;
  67   case 0x8003:
  68         MIRROR_SET((V>>6)&1);
  69         if(V&0x80)
  70         {
  71          ROM_BANK8(0xC000,(V<<1)+1);
  72          ROM_BANK8(0xE000,(V<<1));
  73         }
  74         else
  75         {
  76          ROM_BANK16(0xC000,V);
  77         }
  78         break;
  79  }
  80 }
  81
  82 void Mapper15_init(void)
  83 {
  84         ROM_BANK32(0);
  85         SetWriteHandler(0x8000,0xFFFF,Mapper15_write);
  86 }
  87