/*
** 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.
**
**
** map087.c
**
** Mapper #87 (16K VROM switch)
** Implementation by Firebug
** $Id: map087.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 #87 write handler ($6000-$7FFF) */
/******************************************/
static void map87_write (uint32 address, uint8 value)
{
  /* Within range, address written to is irrelevant */
  UNUSED (address);

  /* Very simple: 8K CHR page is selected by D1 */
  if (value & 0x02) mmc_bankvrom (8, 0x0000, 0x01);
  else              mmc_bankvrom (8, 0x0000, 0x00);

  /* Done */
  return;
}

static const map_memwrite map87_memwrite [] =
{
   { 0x6000, 0x7FFF, map87_write },
   {     -1,     -1, NULL }
};

const mapintf_t map87_intf =
{
   87,                               /* Mapper number */
   "16K VROM switch",                /* Mapper name */
   NULL,                             /* Initialization routine */
   NULL,                             /* VBlank callback */
   NULL,                             /* HBlank callback */
   NULL,                             /* Get state (SNSS) */
   NULL,                             /* Set state (SNSS) */
   NULL,                             /* Memory read structure */
   map87_memwrite,                   /* Memory write structure */
   NULL                              /* External sound device */
};

/*
** $Log: map087.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 06:34:44  firebug
** Initial revision
**
**
*/
