kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
116 wiersze
3.0 KiB
C
Executable File
116 wiersze
3.0 KiB
C
Executable File
/*
|
|
** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
|
|
**
|
|
**
|
|
** This program is free software; you can redistribute it and/or
|
|
** modify it under the terms of version 2 of the GNU Library General
|
|
** Public License as published by the Free Software Foundation.
|
|
**
|
|
** This program is distributed in the hope that it will be useful,
|
|
** but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
** Library General Public License for more details. To obtain a
|
|
** copy of the GNU Library General Public License, write to the Free
|
|
** Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
**
|
|
** Any permitted reproduction of these routines, in whole or in part,
|
|
** must bear this legend.
|
|
**
|
|
**
|
|
** map70.c
|
|
**
|
|
** mapper 70 interface
|
|
** $Id: map070.c,v 1.2 2001/04/27 14:37:11 neil Exp $
|
|
*/
|
|
|
|
#include "noftypes.h"
|
|
#include "nes_mmc.h"
|
|
#include "nes_ppu.h"
|
|
|
|
/* mapper 70: Arkanoid II, Kamen Rider Club, etc. */
|
|
/* ($8000-$FFFF) D6-D4 = switch $8000-$BFFF */
|
|
/* ($8000-$FFFF) D3-D0 = switch PPU $0000-$1FFF */
|
|
/* ($8000-$FFFF) D7 = switch mirroring */
|
|
static void map70_write(uint32 address, uint8 value)
|
|
{
|
|
UNUSED(address);
|
|
|
|
mmc_bankrom(16, 0x8000, (value >> 4) & 0x07);
|
|
mmc_bankvrom(8, 0x0000, value & 0x0F);
|
|
|
|
/* Argh! FanWen used the 4-screen bit to determine
|
|
** whether the game uses D7 to switch between
|
|
** horizontal and vertical mirroring, or between
|
|
** one-screen mirroring from $2000 or $2400.
|
|
*/
|
|
if (mmc_getinfo()->flags & ROM_FLAG_FOURSCREEN)
|
|
{
|
|
if (value & 0x80)
|
|
ppu_mirror(0, 0, 1, 1); /* horiz */
|
|
else
|
|
ppu_mirror(0, 1, 0, 1); /* vert */
|
|
}
|
|
else
|
|
{
|
|
int mirror = (value & 0x80) >> 7;
|
|
ppu_mirror(mirror, mirror, mirror, mirror);
|
|
}
|
|
}
|
|
|
|
static const map_memwrite map70_memwrite[] =
|
|
{
|
|
{ 0x8000, 0xFFFF, map70_write },
|
|
{ -1, -1, NULL }
|
|
};
|
|
|
|
const mapintf_t map70_intf =
|
|
{
|
|
70, /* mapper number */
|
|
"Mapper 70", /* mapper name */
|
|
NULL, /* init routine */
|
|
NULL, /* vblank callback */
|
|
NULL, /* hblank callback */
|
|
NULL, /* get state (snss) */
|
|
NULL, /* set state (snss) */
|
|
NULL, /* memory read structure */
|
|
map70_memwrite, /* memory write structure */
|
|
NULL /* external sound device */
|
|
};
|
|
|
|
/*
|
|
** $Log: map070.c,v $
|
|
** Revision 1.2 2001/04/27 14:37:11 neil
|
|
** wheeee
|
|
**
|
|
** Revision 1.1 2001/04/27 12:54:40 neil
|
|
** blah
|
|
**
|
|
** Revision 1.1.1.1 2001/04/27 07:03:54 neil
|
|
** initial
|
|
**
|
|
** Revision 1.1 2000/10/24 12:19:33 matt
|
|
** changed directory structure
|
|
**
|
|
** Revision 1.7 2000/10/22 19:17:46 matt
|
|
** mapper cleanups galore
|
|
**
|
|
** Revision 1.6 2000/10/22 15:03:13 matt
|
|
** simplified mirroring
|
|
**
|
|
** Revision 1.5 2000/10/21 19:33:38 matt
|
|
** many more cleanups
|
|
**
|
|
** Revision 1.4 2000/08/16 02:50:11 matt
|
|
** random mapper cleanups
|
|
**
|
|
** Revision 1.3 2000/07/10 05:29:03 matt
|
|
** cleaned up some mirroring issues
|
|
**
|
|
** Revision 1.2 2000/07/06 02:48:43 matt
|
|
** clearly labelled structure members
|
|
**
|
|
** Revision 1.1 2000/07/06 01:01:56 matt
|
|
** initial revision
|
|
**
|
|
*/
|