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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.
**
**
** map75.c
**
** mapper 75 interface
** $Id: map075.c,v 1.2 2001/04/27 14:37:11 neil Exp $
*/
#include <noftypes.h>
#include <nes_mmc.h>
#include <nes_ppu.h>
static uint8 latch[2];
static uint8 hibits;
/* mapper 75: Konami VRC1 */
static void map75_write(uint32 address, uint8 value)
{
switch ((address & 0xF000) >> 12)
{
case 0x8:
mmc_bankrom(8, 0x8000, value);
break;
case 0x9:
hibits = (value & 0x06);
mmc_bankvrom(4, 0x0000, ((hibits & 0x02) << 3) | latch[0]);
mmc_bankvrom(4, 0x1000, ((hibits & 0x04) << 2) | latch[1]);
if (value & 1)
ppu_mirror(0, 1, 0, 1); /* vert */
else
ppu_mirror(0, 0, 1, 1); /* horiz */
break;
case 0xA:
mmc_bankrom(8, 0xA000, value);
break;
case 0xC:
mmc_bankrom(8, 0xC000, value);
break;
case 0xE:
latch[0] = (value & 0x0F);
mmc_bankvrom(4, 0x0000, ((hibits & 0x02) << 3) | latch[0]);
break;
case 0xF:
latch[1] = (value & 0x0F);
mmc_bankvrom(4, 0x1000, ((hibits & 0x04) << 2) | latch[1]);
break;
default:
break;
}
}
static map_memwrite map75_memwrite[] =
{
{ 0x8000, 0xFFFF, map75_write },
{ -1, -1, NULL }
};
mapintf_t map75_intf =
{
75, /* mapper number */
"Konami VRC1", /* mapper name */
NULL, /* init routine */
NULL, /* vblank callback */
NULL, /* hblank callback */
NULL, /* get state (snss) */
NULL, /* set state (snss) */
NULL, /* memory read structure */
map75_memwrite, /* memory write structure */
NULL /* external sound device */
};
/*
** $Log: map075.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 1.6 2000/10/22 19:17:46 matt
** mapper cleanups galore
**
** Revision 1.5 2000/10/22 15:03:14 matt
** simplified mirroring
**
** Revision 1.4 2000/10/21 19:33:38 matt
** many more 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
**
*/
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