1  /*
  2  ** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
  3  **
  4  **
  5  ** This program is free software; you can redistribute it and/or
  6  ** modify it under the terms of version 2 of the GNU Library General 
  7  ** Public License as published by the Free Software Foundation.
  8  **
  9  ** This program is distributed in the hope that it will be useful, 
 10  ** but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU 
 12  ** Library General Public License for more details.  To obtain a 
 13  ** copy of the GNU Library General Public License, write to the Free 
 14  ** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 15  **
 16  ** Any permitted reproduction of these routines, in whole or in part,
 17  ** must bear this legend.
 18  **
 19  **
 20  ** map78.c
 21  **
 22  ** mapper 78 interface
 23  ** $Id: map078.c,v 1.2 2001/04/27 14:37:11 neil Exp $
 24  */
 25  
 26  #include "noftypes.h"
 27  #include "nes_mmc.h"
 28  #include "nes_ppu.h"
 29  
 30  /* mapper 78: Holy Diver, Cosmo Carrier */
 31  /* ($8000-$FFFF) D2-D0 = switch $8000-$BFFF */
 32  /* ($8000-$FFFF) D7-D4 = switch PPU $0000-$1FFF */
 33  /* ($8000-$FFFF) D3 = switch mirroring */
 34  static void map78_write(uint32 address, uint8 value)
 35  {
 36     UNUSED(address);
 37  
 38     mmc_bankrom(16, 0x8000, value & 7);
 39     mmc_bankvrom(8, 0x0000, (value >> 4) & 0x0F);
 40  
 41     /* Ugh! Same abuse of the 4-screen bit as with Mapper #70 */
 42     if (mmc_getinfo()->flags & ROM_FLAG_FOURSCREEN)
 43     {
 44        if (value & 0x08)
 45           ppu_mirror(0, 1, 0, 1); /* vert */
 46        else
 47           ppu_mirror(0, 0, 1, 1); /* horiz */
 48     }
 49     else
 50     {
 51        int mirror = (value >> 3) & 1;
 52        ppu_mirror(mirror, mirror, mirror, mirror);
 53     }
 54  }
 55  
 56  static const map_memwrite map78_memwrite[] =
 57  {
 58     { 0x8000, 0xFFFF, map78_write },
 59     {     -1,     -1, NULL }
 60  };
 61  
 62  const mapintf_t map78_intf =
 63  {
 64     78, /* mapper number */
 65     "Mapper 78", /* mapper name */
 66     NULL, /* init routine */
 67     NULL, /* vblank callback */
 68     NULL, /* hblank callback */
 69     NULL, /* get state (snss) */
 70     NULL, /* set state (snss) */
 71     NULL, /* memory read structure */
 72     map78_memwrite, /* memory write structure */
 73     NULL /* external sound device */
 74  };
 75  
 76  /*
 77  ** $Log: map078.c,v $
 78  ** Revision 1.2  2001/04/27 14:37:11  neil
 79  ** wheeee
 80  **
 81  ** Revision 1.1  2001/04/27 12:54:40  neil
 82  ** blah
 83  **
 84  ** Revision 1.1.1.1  2001/04/27 07:03:54  neil
 85  ** initial
 86  **
 87  ** Revision 1.1  2000/10/24 12:19:33  matt
 88  ** changed directory structure
 89  **
 90  ** Revision 1.7  2000/10/22 19:17:46  matt
 91  ** mapper cleanups galore
 92  **
 93  ** Revision 1.6  2000/10/22 15:03:14  matt
 94  ** simplified mirroring
 95  **
 96  ** Revision 1.5  2000/10/21 19:33:38  matt
 97  ** many more cleanups
 98  **
 99  ** Revision 1.4  2000/08/16 02:50:11  matt
100  ** random mapper cleanups
101  **
102  ** Revision 1.3  2000/07/10 05:29:03  matt
103  ** cleaned up some mirroring issues
104  **
105  ** Revision 1.2  2000/07/06 02:48:43  matt
106  ** clearly labelled structure members
107  **
108  ** Revision 1.1  2000/07/06 01:01:56  matt
109  ** initial revision
110  **
111  */