kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
86 wiersze
2.4 KiB
C
Executable File
86 wiersze
2.4 KiB
C
Executable File
/*
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** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
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**
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of version 2 of the GNU Library General
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** Public License as published by the Free Software Foundation.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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** Library General Public License for more details. To obtain a
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** copy of the GNU Library General Public License, write to the Free
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** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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**
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** Any permitted reproduction of these routines, in whole or in part,
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** must bear this legend.
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**
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**
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** map087.c
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**
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** Mapper #87 (16K VROM switch)
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** Implementation by Firebug
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** $Id: map087.c,v 1.2 2001/04/27 14:37:11 neil Exp $
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**
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*/
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#include "noftypes.h"
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#include "nes_mmc.h"
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#include "nes.h"
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#include "libsnss.h"
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#include "log.h"
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/******************************************/
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/* Mapper #87 write handler ($6000-$7FFF) */
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/******************************************/
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static void map87_write (uint32 address, uint8 value)
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{
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/* Within range, address written to is irrelevant */
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UNUSED (address);
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/* Very simple: 8K CHR page is selected by D1 */
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if (value & 0x02) mmc_bankvrom (8, 0x0000, 0x01);
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else mmc_bankvrom (8, 0x0000, 0x00);
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/* Done */
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return;
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}
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static const map_memwrite map87_memwrite [] =
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{
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{ 0x6000, 0x7FFF, map87_write },
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{ -1, -1, NULL }
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};
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const mapintf_t map87_intf =
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{
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87, /* Mapper number */
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"16K VROM switch", /* Mapper name */
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NULL, /* Initialization routine */
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NULL, /* VBlank callback */
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NULL, /* HBlank callback */
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NULL, /* Get state (SNSS) */
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NULL, /* Set state (SNSS) */
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NULL, /* Memory read structure */
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map87_memwrite, /* Memory write structure */
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NULL /* External sound device */
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};
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/*
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** $Log: map087.c,v $
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** Revision 1.2 2001/04/27 14:37:11 neil
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** wheeee
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**
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** Revision 1.1 2001/04/27 12:54:40 neil
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** blah
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**
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** Revision 1.1 2001/04/27 10:57:41 neil
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** wheee
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**
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** Revision 1.1 2000/12/30 06:34:44 firebug
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** Initial revision
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**
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**
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*/
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