map078.c
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/*
** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
**
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of version 2 of the GNU Library General
** Public License as published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Library General Public License for more details. To obtain a
** copy of the GNU Library General Public License, write to the Free
** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
** Any permitted reproduction of these routines, in whole or in part,
** must bear this legend.
**
**
** map78.c
**
** mapper 78 interface
** $Id: map078.c,v 1.2 2001/04/27 14:37:11 neil Exp $
*/
#include <noftypes.h>
#include <nes_mmc.h>
#include <nes_ppu.h>
/* mapper 78: Holy Diver, Cosmo Carrier */
/* ($8000-$FFFF) D2-D0 = switch $8000-$BFFF */
/* ($8000-$FFFF) D7-D4 = switch PPU $0000-$1FFF */
/* ($8000-$FFFF) D3 = switch mirroring */
static void map78_write(uint32 address, uint8 value)
{
UNUSED(address);
mmc_bankrom(16, 0x8000, value & 7);
mmc_bankvrom(8, 0x0000, (value >> 4) & 0x0F);
/* Ugh! Same abuse of the 4-screen bit as with Mapper #70 */
if (mmc_getinfo()->flags & ROM_FLAG_FOURSCREEN)
{
if (value & 0x08)
ppu_mirror(0, 1, 0, 1); /* vert */
else
ppu_mirror(0, 0, 1, 1); /* horiz */
}
else
{
int mirror = (value >> 3) & 1;
ppu_mirror(mirror, mirror, mirror, mirror);
}
}
static map_memwrite map78_memwrite[] =
{
{ 0x8000, 0xFFFF, map78_write },
{ -1, -1, NULL }
};
mapintf_t map78_intf =
{
78, /* mapper number */
"Mapper 78", /* mapper name */
NULL, /* init routine */
NULL, /* vblank callback */
NULL, /* hblank callback */
NULL, /* get state (snss) */
NULL, /* set state (snss) */
NULL, /* memory read structure */
map78_memwrite, /* memory write structure */
NULL /* external sound device */
};
/*
** $Log: map078.c,v $
** Revision 1.2 2001/04/27 14:37:11 neil
** wheeee
**
** Revision 1.1 2001/04/27 12:54:40 neil
** blah
**
** Revision 1.1.1.1 2001/04/27 07:03:54 neil
** initial
**
** Revision 1.1 2000/10/24 12:19:33 matt
** changed directory structure
**
** Revision 1.7 2000/10/22 19:17:46 matt
** mapper cleanups galore
**
** Revision 1.6 2000/10/22 15:03:14 matt
** simplified mirroring
**
** Revision 1.5 2000/10/21 19:33:38 matt
** many more cleanups
**
** Revision 1.4 2000/08/16 02:50:11 matt
** random mapper cleanups
**
** Revision 1.3 2000/07/10 05:29:03 matt
** cleaned up some mirroring issues
**
** Revision 1.2 2000/07/06 02:48:43 matt
** clearly labelled structure members
**
** Revision 1.1 2000/07/06 01:01:56 matt
** initial revision
**
*/