kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
145 wiersze
3.2 KiB
C
Executable File
145 wiersze
3.2 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.
|
|
**
|
|
**
|
|
** 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 const map_memwrite map65_memwrite[] =
|
|
{
|
|
{ 0x8000, 0xFFFF, map65_write },
|
|
{ -1, -1, NULL }
|
|
};
|
|
|
|
const 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
|
|
**
|
|
*/
|