map065.c
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/*
** 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.
**
**
** map65.c
**
** mapper 65 interface
** $Id: map065.c,v 1.2 2001/04/27 14:37:11 neil Exp $
*/
#include <noftypes.h>
#include <nes_mmc.h>
#include <nes_ppu.h>
static struct
{
int counter;
bool enabled;
int cycles;
uint8 low, high;
} irq;
static void map65_init(void)
{
irq.counter = 0;
irq.enabled = false;
irq.low = irq.high = 0;
irq.cycles = 0;
}
/* TODO: shouldn't there be some kind of HBlank callback??? */
/* mapper 65: Irem H-3001*/
static void map65_write(uint32 address, uint8 value)
{
int range = address & 0xF000;
int reg = address & 7;
switch (range)
{
case 0x8000:
case 0xA000:
case 0xC000:
mmc_bankrom(8, range, value);
break;
case 0xB000:
mmc_bankvrom(1, reg << 10, value);
break;
case 0x9000:
switch (reg)
{
case 4:
irq.enabled = (value & 0x01) ? false : true;
break;
case 5:
irq.high = value;
irq.cycles = (irq.high << 8) | irq.low;
irq.counter = (uint8)(irq.cycles / 128);
break;
case 6:
irq.low = value;
irq.cycles = (irq.high << 8) | irq.low;
irq.counter = (uint8)(irq.cycles / 128);
break;
default:
break;
}
break;
default:
break;
}
}
static map_memwrite map65_memwrite[] =
{
{ 0x8000, 0xFFFF, map65_write },
{ -1, -1, NULL }
};
mapintf_t map65_intf =
{
65, /* mapper number */
"Irem H-3001", /* mapper name */
map65_init, /* init routine */
NULL, /* vblank callback */
NULL, /* hblank callback */
NULL, /* get state (snss) */
NULL, /* set state (snss) */
NULL, /* memory read structure */
map65_memwrite, /* memory write structure */
NULL /* external sound device */
};
/*
** $Log: map065.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 1.5 2000/10/22 19:17:46 matt
** mapper cleanups galore
**
** Revision 1.4 2000/10/21 19:33:38 matt
** many more cleanups
**
** Revision 1.3 2000/10/10 13:58:17 matt
** stroustrup squeezing his way in the door
**
** 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
**
*/