kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
141 wiersze
3.1 KiB
C
Executable File
141 wiersze
3.1 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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** map160.c
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**
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** mapper 160 interface
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** $Id: map160.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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#include "nes.h"
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static struct
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{
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bool enabled, expired;
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int counter;
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int latch_c005, latch_c003;
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} irq;
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static void map160_write(uint32 address, uint8 value)
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{
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if (address >= 0x8000 && address <= 0x8003)
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{
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mmc_bankrom(8, 0x8000 + 0x2000 * (address & 3), value);
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}
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else if (address >= 0x9000 && address <= 0x9007)
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{
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mmc_bankvrom(1, 0x400 * (address & 7), value);
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}
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else if (0xC002 == address)
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{
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irq.enabled = false;
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irq.latch_c005 = irq.latch_c003;
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}
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else if (0xC003 == address)
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{
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if (false == irq.expired)
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{
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irq.counter = value;
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}
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else
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{
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irq.expired = false;
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irq.enabled = true;
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irq.counter = irq.latch_c005;
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}
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}
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else if (0xC005 == address)
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{
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irq.latch_c005 = value;
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irq.counter = value;
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}
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#ifdef NOFRENDO_DEBUG
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else
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{
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log_printf("mapper 160: untrapped write $%02X to $%04X\n", value, address);
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}
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#endif /* NOFRENDO_DEBUG */
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}
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static void map160_hblank(int vblank)
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{
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if (!vblank)
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{
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if (ppu_enabled() && irq.enabled)
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{
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if (0 == irq.counter && false == irq.expired)
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{
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irq.expired = true;
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nes_irq();
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}
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else
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{
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irq.counter--;
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}
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}
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}
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}
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static void map160_init(void)
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{
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irq.enabled = false;
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irq.expired = false;
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irq.counter = 0;
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irq.latch_c003 = irq.latch_c005 = 0;
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}
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static const map_memwrite map160_memwrite[] =
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{
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{ 0x8000, 0xFFFF, map160_write },
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{ -1, -1, NULL }
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};
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const mapintf_t map160_intf =
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{
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160, /* mapper number */
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"Aladdin (pirate)", /* mapper name */
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map160_init, /* init routine */
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NULL, /* vblank callback */
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map160_hblank, /* 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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map160_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: map160.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 2001/04/27 10:57:41 neil
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** wheee
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**
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** Revision 1.1 2000/12/27 04:24:46 matt
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** initial revision
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**
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*/
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