kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
153 wiersze
4.2 KiB
C
Executable File
153 wiersze
4.2 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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** map046.c
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**
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** Mapper #46 (Pelican Game Station)
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** Implementation by Firebug
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** Mapper information courtesy of Kevin Horton
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** $Id: map046.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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static uint8 prg_low_bank;
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static uint8 chr_low_bank;
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static uint8 prg_high_bank;
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static uint8 chr_high_bank;
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/*************************************************/
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/* Set banks from the combined register values */
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/*************************************************/
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static void map46_set_banks (void)
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{
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/* Set the PRG and CHR pages */
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mmc_bankrom (32, 0x8000, (prg_high_bank << 1) | (prg_low_bank));
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mmc_bankvrom (8, 0x0000, (chr_high_bank << 3) | (chr_low_bank));
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/* Done */
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return;
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}
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/*********************************************************/
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/* Mapper #46: Pelican Game Station (aka Rumble Station) */
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/*********************************************************/
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static void map46_init (void)
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{
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/* High bank switch register is set to zero on reset */
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prg_high_bank = 0x00;
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chr_high_bank = 0x00;
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map46_set_banks ();
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/* Done */
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return;
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}
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/******************************************/
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/* Mapper #46 write handler ($6000-$FFFF) */
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/******************************************/
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static void map46_write (uint32 address, uint8 value)
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{
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/* $8000-$FFFF: D6-D4 = lower three bits of CHR bank */
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/* D0 = low bit of PRG bank */
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/* $6000-$7FFF: D7-D4 = high four bits of CHR bank */
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/* D3-D0 = high four bits of PRG bank */
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if (address & 0x8000)
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{
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prg_low_bank = value & 0x01;
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chr_low_bank = (value >> 4) & 0x07;
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map46_set_banks ();
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}
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else
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{
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prg_high_bank = value & 0x0F;
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chr_high_bank = (value >> 4) & 0x0F;
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map46_set_banks ();
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}
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/* Done */
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return;
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}
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/****************************************************/
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/* Shove extra mapper information into a SNSS block */
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/****************************************************/
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static void map46_setstate (SnssMapperBlock *state)
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{
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/* TODO: Store SNSS information */
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UNUSED (state);
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/* Done */
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return;
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}
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/*****************************************************/
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/* Pull extra mapper information out of a SNSS block */
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/*****************************************************/
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static void map46_getstate (SnssMapperBlock *state)
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{
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/* TODO: Retrieve SNSS information */
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UNUSED (state);
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/* Done */
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return;
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}
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static const map_memwrite map46_memwrite [] =
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{
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{ 0x6000, 0xFFFF, map46_write },
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{ -1, -1, NULL }
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};
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const mapintf_t map46_intf =
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{
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46, /* Mapper number */
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"Pelican Game Station", /* Mapper name */
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map46_init, /* Initialization routine */
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NULL, /* VBlank callback */
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NULL, /* HBlank callback */
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map46_getstate, /* Get state (SNSS) */
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map46_setstate, /* Set state (SNSS) */
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NULL, /* Memory read structure */
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map46_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: map046.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 2000/12/27 19:23:05 firebug
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** initial revision
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**
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**
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*/
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