map229.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.
**
**
** map229.c
**
** Mapper #229 (31 in 1)
** Implementation by Firebug
** Mapper information courtesy of Mark Knibbs
** $Id: map229.c,v 1.2 2001/04/27 14:37:11 neil Exp $
**
*/
#include <noftypes.h>
#include <nes_mmc.h>
#include <nes.h>
#include <libsnss.h>
#include <log.h>
/************************/
/* Mapper #229: 31 in 1 */
/************************/
static void map229_init (void)
{
/* On reset, PRG is set to first 32K and CHR to first 8K */
mmc_bankrom (32, 0x8000, 0x00);
mmc_bankvrom (8, 0x0000, 0x00);
/* Done */
return;
}
/*******************************************/
/* Mapper #229 write handler ($8000-$FFFF) */
/*******************************************/
static void map229_write (uint32 address, uint8 value)
{
/* Value written is irrelevant */
UNUSED (value);
/* A4-A0 sets 8K CHR page */
mmc_bankvrom (8, 0x0000, (uint8) (address & 0x1F));
/* If A4-A1 are all low then select the first 32K, */
/* otherwise select a 16K bank at both $8000 and $C000 */
if ((address & 0x1E) == 0x00)
{
mmc_bankrom (32, 0x8000, 0x00);
}
else
{
mmc_bankrom (16, 0x8000, (uint8) (address & 0x1F));
mmc_bankrom (16, 0xC000, (uint8) (address & 0x1F));
}
/* A5: mirroring (low = vertical, high = horizontal) */
if (address & 0x20) ppu_mirror(0, 0, 1, 1);
else ppu_mirror(0, 1, 0, 1);
/* Done */
return;
}
static map_memwrite map229_memwrite [] =
{
{ 0x8000, 0xFFFF, map229_write },
{ -1, -1, NULL }
};
mapintf_t map229_intf =
{
229, /* Mapper number */
"31 in 1 (bootleg)", /* Mapper name */
map229_init, /* Initialization routine */
NULL, /* VBlank callback */
NULL, /* HBlank callback */
NULL, /* Get state (SNSS) */
NULL, /* Set state (SNSS) */
NULL, /* Memory read structure */
map229_memwrite, /* Memory write structure */
NULL /* External sound device */
};
/*
** $Log: map229.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 2001/04/27 10:57:41 neil
** wheee
**
** Revision 1.1 2000/12/30 06:34:31 firebug
** Initial revision
**
**
*/