MCUME/MCUME_teensy/teensynofrendo/map064.c

235 wiersze
5.1 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.
**
**
** map64.c
**
** mapper 64 interface
** $Id: map064.c,v 1.2 2001/04/27 14:37:11 neil Exp $
*/
#include "noftypes.h"
#include "nes_mmc.h"
#include "nes.h"
#include "log.h"
static struct
{
int counter, latch;
bool enabled, reset;
} irq;
static uint8 command = 0;
static uint16 vrombase = 0x0000;
static void map64_hblank(int vblank)
{
if (vblank)
return;
irq.reset = false;
if (ppu_enabled())
{
if (0 == irq.counter--)
{
irq.counter = irq.latch;
if (true == irq.enabled)
nes_irq();
irq.reset = true;
}
}
}
/* mapper 64: Tengen RAMBO-1 */
static void map64_write(uint32 address, uint8 value)
{
switch (address & 0xE001)
{
case 0x8000:
command = value;
vrombase = (value & 0x80) ? 0x1000 : 0x0000;
break;
case 0x8001:
switch (command & 0xF)
{
case 0:
mmc_bankvrom(1, 0x0000 ^ vrombase, value);
mmc_bankvrom(1, 0x0400 ^ vrombase, value);
break;
case 1:
mmc_bankvrom(1, 0x0800 ^ vrombase, value);
mmc_bankvrom(1, 0x0C00 ^ vrombase, value);
break;
case 2:
mmc_bankvrom(1, 0x1000 ^ vrombase, value);
break;
case 3:
mmc_bankvrom(1, 0x1400 ^ vrombase, value);
break;
case 4:
mmc_bankvrom(1, 0x1800 ^ vrombase, value);
break;
case 5:
mmc_bankvrom(1, 0x1C00 ^ vrombase, value);
break;
case 6:
mmc_bankrom(8, (command & 0x40) ? 0xA000 : 0x8000, value);
break;
case 7:
mmc_bankrom(8, (command & 0x40) ? 0xC000 : 0xA000, value);
break;
case 8:
mmc_bankvrom(1, 0x0400, value);
break;
case 9:
mmc_bankvrom(1, 0x0C00, value);
break;
case 15:
mmc_bankrom(8, (command & 0x40) ? 0x8000 : 0xC000, value);
break;
default:
#ifdef NOFRENDO_DEBUG
log_printf("mapper 64: unknown command #%d", command & 0xF);
#endif
break;
}
break;
case 0xA000:
if (value & 1)
ppu_mirror(0, 0, 1, 1);
else
ppu_mirror(0, 1, 0, 1);
break;
case 0xC000:
//irq.counter = value;
irq.latch = value;
break;
case 0xC001:
//irq.latch = value;
irq.reset = true;
break;
case 0xE000:
//irq.counter = irq.latch;
irq.enabled = false;
break;
case 0xE001:
irq.enabled = true;
break;
default:
#ifdef NOFRENDO_DEBUG
log_printf("mapper 64: Wrote $%02X to $%04X", value, address);
#endif
break;
}
if (true == irq.reset)
irq.counter = irq.latch;
}
static void map64_init(void)
{
mmc_bankrom(8, 0x8000, MMC_LASTBANK);
mmc_bankrom(8, 0xA000, MMC_LASTBANK);
mmc_bankrom(8, 0xC000, MMC_LASTBANK);
mmc_bankrom(8, 0xE000, MMC_LASTBANK);
irq.counter = irq.latch = 0;
irq.reset = irq.enabled = false;
}
static const map_memwrite map64_memwrite[] =
{
{ 0x8000, 0xFFFF, map64_write },
{ -1, -1, NULL }
};
const mapintf_t map64_intf =
{
64, /* mapper number */
"Tengen RAMBO-1", /* mapper name */
map64_init, /* init routine */
NULL, /* vblank callback */
map64_hblank, /* hblank callback */
NULL, /* get state (snss) */
NULL, /* set state (snss) */
NULL, /* memory read structure */
map64_memwrite, /* memory write structure */
NULL /* external sound device */
};
/*
** $Log: map064.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 1.8 2000/10/22 19:17:46 matt
** mapper cleanups galore
**
** Revision 1.7 2000/10/22 15:03:13 matt
** simplified mirroring
**
** Revision 1.6 2000/10/21 19:33:38 matt
** many more cleanups
**
** Revision 1.5 2000/10/10 13:58:17 matt
** stroustrup squeezing his way in the door
**
** Revision 1.4 2000/07/10 13:51:25 matt
** using generic nes_irq() routine now
**
** 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 2000/07/05 05:05:18 matt
** initial revision
**
*/