kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
145 wiersze
3.6 KiB
C
145 wiersze
3.6 KiB
C
/*
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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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** map15.c
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**
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** mapper 15 interface
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** $Id: map015.c,v 1.2 2001/04/27 14:37:11 neil Exp $
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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_ppu.h"
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/* mapper 15: Contra 100-in-1 */
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static void map15_write(uint32 address, uint8 value)
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{
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int bank = value & 0x3F;
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uint8 swap = (value & 0x80) >> 7;
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switch (address & 0x3)
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{
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case 0:
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mmc_bankrom(8, 0x8000, (bank << 1) + swap);
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mmc_bankrom(8, 0xA000, (bank << 1) + (swap ^ 1));
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mmc_bankrom(8, 0xC000, ((bank + 1) << 1) + swap);
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mmc_bankrom(8, 0xE000, ((bank + 1) << 1) + (swap ^ 1));
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if (value & 0x40)
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ppu_mirror(0, 0, 1, 1); /* horizontal */
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else
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ppu_mirror(0, 1, 0, 1); /* vertical */
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break;
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case 1:
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mmc_bankrom(8, 0xC000, (bank << 1) + swap);
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mmc_bankrom(8, 0xE000, (bank << 1) + (swap ^ 1));
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break;
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case 2:
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if (swap)
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{
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mmc_bankrom(8, 0x8000, (bank << 1) + 1);
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mmc_bankrom(8, 0xA000, (bank << 1) + 1);
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mmc_bankrom(8, 0xC000, (bank << 1) + 1);
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mmc_bankrom(8, 0xE000, (bank << 1) + 1);
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}
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else
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{
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mmc_bankrom(8, 0x8000, (bank << 1));
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mmc_bankrom(8, 0xA000, (bank << 1));
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mmc_bankrom(8, 0xC000, (bank << 1));
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mmc_bankrom(8, 0xE000, (bank << 1));
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}
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break;
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case 3:
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mmc_bankrom(8, 0xC000, (bank << 1) + swap);
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mmc_bankrom(8, 0xE000, (bank << 1) + (swap ^ 1));
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if (value & 0x40)
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ppu_mirror(0, 0, 1, 1); /* horizontal */
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else
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ppu_mirror(0, 1, 0, 1); /* vertical */
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break;
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default:
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break;
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}
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}
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static void map15_init(void)
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{
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mmc_bankrom(32, 0x8000, 0);
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}
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static const map_memwrite map15_memwrite[] =
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{
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{ 0x8000, 0xFFFF, map15_write },
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{ -1, -1, NULL }
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};
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const mapintf_t map15_intf =
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{
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15, /* mapper number */
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"Contra 100-in-1", /* mapper name */
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map15_init, /* init 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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map15_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: map015.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 1.1.1.1 2001/04/27 07:03:54 neil
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** initial
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**
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** Revision 1.1 2000/10/24 12:19:33 matt
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** changed directory structure
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**
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** Revision 1.6 2000/10/22 19:17:46 matt
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** mapper cleanups galore
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**
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** Revision 1.5 2000/10/22 15:03:13 matt
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** simplified mirroring
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**
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** Revision 1.4 2000/10/21 19:33:38 matt
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** many more cleanups
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**
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** Revision 1.3 2000/07/10 05:29:03 matt
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** cleaned up some mirroring issues
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**
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** Revision 1.2 2000/07/06 02:48:43 matt
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** clearly labelled structure members
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**
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** Revision 1.1 2000/07/05 05:05:18 matt
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** initial revision
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**
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*/
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