map015.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.
**
**
** map15.c
**
** mapper 15 interface
** $Id: map015.c,v 1.2 2001/04/27 14:37:11 neil Exp $
*/
#include <noftypes.h>
#include <nes_mmc.h>
#include <nes_ppu.h>
/* mapper 15: Contra 100-in-1 */
static void map15_write(uint32 address, uint8 value)
{
int bank = value & 0x3F;
uint8 swap = (value & 0x80) >> 7;
switch (address & 0x3)
{
case 0:
mmc_bankrom(8, 0x8000, (bank << 1) + swap);
mmc_bankrom(8, 0xA000, (bank << 1) + (swap ^ 1));
mmc_bankrom(8, 0xC000, ((bank + 1) << 1) + swap);
mmc_bankrom(8, 0xE000, ((bank + 1) << 1) + (swap ^ 1));
if (value & 0x40)
ppu_mirror(0, 0, 1, 1); /* horizontal */
else
ppu_mirror(0, 1, 0, 1); /* vertical */
break;
case 1:
mmc_bankrom(8, 0xC000, (bank << 1) + swap);
mmc_bankrom(8, 0xE000, (bank << 1) + (swap ^ 1));
break;
case 2:
if (swap)
{
mmc_bankrom(8, 0x8000, (bank << 1) + 1);
mmc_bankrom(8, 0xA000, (bank << 1) + 1);
mmc_bankrom(8, 0xC000, (bank << 1) + 1);
mmc_bankrom(8, 0xE000, (bank << 1) + 1);
}
else
{
mmc_bankrom(8, 0x8000, (bank << 1));
mmc_bankrom(8, 0xA000, (bank << 1));
mmc_bankrom(8, 0xC000, (bank << 1));
mmc_bankrom(8, 0xE000, (bank << 1));
}
break;
case 3:
mmc_bankrom(8, 0xC000, (bank << 1) + swap);
mmc_bankrom(8, 0xE000, (bank << 1) + (swap ^ 1));
if (value & 0x40)
ppu_mirror(0, 0, 1, 1); /* horizontal */
else
ppu_mirror(0, 1, 0, 1); /* vertical */
break;
default:
break;
}
}
static void map15_init(void)
{
mmc_bankrom(32, 0x8000, 0);
}
static map_memwrite map15_memwrite[] =
{
{ 0x8000, 0xFFFF, map15_write },
{ -1, -1, NULL }
};
mapintf_t map15_intf =
{
15, /* mapper number */
"Contra 100-in-1", /* mapper name */
map15_init, /* init routine */
NULL, /* vblank callback */
NULL, /* hblank callback */
NULL, /* get state (snss) */
NULL, /* set state (snss) */
NULL, /* memory read structure */
map15_memwrite, /* memory write structure */
NULL /* external sound device */
};
/*
** $Log: map015.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 15:03:13 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 2000/07/05 05:05:18 matt
** initial revision
**
*/