kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
112 wiersze
2.9 KiB
C
Executable File
112 wiersze
2.9 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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** map78.c
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**
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** mapper 78 interface
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** $Id: map078.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 78: Holy Diver, Cosmo Carrier */
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/* ($8000-$FFFF) D2-D0 = switch $8000-$BFFF */
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/* ($8000-$FFFF) D7-D4 = switch PPU $0000-$1FFF */
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/* ($8000-$FFFF) D3 = switch mirroring */
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static void map78_write(uint32 address, uint8 value)
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{
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UNUSED(address);
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mmc_bankrom(16, 0x8000, value & 7);
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mmc_bankvrom(8, 0x0000, (value >> 4) & 0x0F);
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/* Ugh! Same abuse of the 4-screen bit as with Mapper #70 */
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if (mmc_getinfo()->flags & ROM_FLAG_FOURSCREEN)
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{
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if (value & 0x08)
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ppu_mirror(0, 1, 0, 1); /* vert */
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else
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ppu_mirror(0, 0, 1, 1); /* horiz */
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}
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else
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{
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int mirror = (value >> 3) & 1;
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ppu_mirror(mirror, mirror, mirror, mirror);
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}
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}
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static const map_memwrite map78_memwrite[] =
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{
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{ 0x8000, 0xFFFF, map78_write },
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{ -1, -1, NULL }
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};
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const mapintf_t map78_intf =
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{
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78, /* mapper number */
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"Mapper 78", /* mapper name */
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NULL, /* 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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map78_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: map078.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 1.7 2000/10/22 19:17:46 matt
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** mapper cleanups galore
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**
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** Revision 1.6 2000/10/22 15:03:14 matt
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** simplified mirroring
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**
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** Revision 1.5 2000/10/21 19:33:38 matt
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** many more cleanups
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**
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** Revision 1.4 2000/08/16 02:50:11 matt
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** random mapper 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 2000/07/06 01:01:56 matt
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** initial revision
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**
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*/
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