kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
115 wiersze
3.1 KiB
C
Executable File
115 wiersze
3.1 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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** map229.c
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**
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** Mapper #229 (31 in 1)
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** Implementation by Firebug
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** Mapper information courtesy of Mark Knibbs
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** $Id: map229.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 #229: 31 in 1 */
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/************************/
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static void map229_init (void)
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{
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/* On reset, PRG is set to first 32K and CHR to first 8K */
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mmc_bankrom (32, 0x8000, 0x00);
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mmc_bankvrom (8, 0x0000, 0x00);
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/* Done */
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return;
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}
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/*******************************************/
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/* Mapper #229 write handler ($8000-$FFFF) */
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/*******************************************/
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static void map229_write (uint32 address, uint8 value)
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{
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/* Value written is irrelevant */
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UNUSED (value);
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/* A4-A0 sets 8K CHR page */
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mmc_bankvrom (8, 0x0000, (uint8) (address & 0x1F));
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/* If A4-A1 are all low then select the first 32K, */
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/* otherwise select a 16K bank at both $8000 and $C000 */
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if ((address & 0x1E) == 0x00)
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{
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mmc_bankrom (32, 0x8000, 0x00);
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}
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else
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{
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mmc_bankrom (16, 0x8000, (uint8) (address & 0x1F));
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mmc_bankrom (16, 0xC000, (uint8) (address & 0x1F));
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}
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/* A5: mirroring (low = vertical, high = horizontal) */
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if (address & 0x20) ppu_mirror(0, 0, 1, 1);
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else ppu_mirror(0, 1, 0, 1);
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/* Done */
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return;
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}
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static const map_memwrite map229_memwrite [] =
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{
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{ 0x8000, 0xFFFF, map229_write },
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{ -1, -1, NULL }
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};
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const mapintf_t map229_intf =
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{
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229, /* Mapper number */
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"31 in 1 (bootleg)", /* Mapper name */
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map229_init, /* 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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map229_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: map229.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 06:34:31 firebug
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** Initial revision
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**
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**
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*/
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