kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
171 wiersze
4.1 KiB
C
Executable File
171 wiersze
4.1 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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** map19.c
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**
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** mapper 19 interface
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** $Id: map019.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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/* TODO: shouldn't there be an h-blank IRQ handler??? */
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/* Special mirroring macro for mapper 19 */
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#define N_BANK1(table, value) \
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{ \
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if ((value) < 0xE0) \
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ppu_setpage(1, (table) + 8, &mmc_getinfo()->vrom[((value) % (mmc_getinfo()->vrom_banks * 8)) << 10] - (0x2000 + ((table) << 10))); \
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else \
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ppu_setpage(1, (table) + 8, &mmc_getinfo()->vram[((value) & 7) << 10] - (0x2000 + ((table) << 10))); \
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ppu_mirrorhipages(); \
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}
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static struct
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{
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int counter, enabled;
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} irq;
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static void map19_init(void)
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{
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irq.counter = irq.enabled = 0;
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}
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/* mapper 19: Namcot 106 */
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static void map19_write(uint32 address, uint8 value)
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{
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int reg = address >> 11;
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switch (reg)
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{
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case 0xA:
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irq.counter &= ~0xFF;
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irq.counter |= value;
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break;
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case 0xB:
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irq.counter = ((value & 0x7F) << 8) | (irq.counter & 0xFF);
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irq.enabled = (value & 0x80) ? true : false;
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break;
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case 0x10:
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case 0x11:
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case 0x12:
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case 0x13:
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case 0x14:
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case 0x15:
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case 0x16:
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case 0x17:
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mmc_bankvrom(1, (reg & 7) << 10, value);
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break;
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case 0x18:
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case 0x19:
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case 0x1A:
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case 0x1B:
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N_BANK1(reg & 3, value);
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break;
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case 0x1C:
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mmc_bankrom(8, 0x8000, value);
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break;
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case 0x1D:
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mmc_bankrom(8, 0xA000, value);
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break;
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case 0x1E:
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mmc_bankrom(8, 0xC000, value);
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break;
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default:
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break;
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}
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}
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static void map19_getstate(SnssMapperBlock *state)
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{
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state->extraData.mapper19.irqCounterLowByte = irq.counter & 0xFF;
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state->extraData.mapper19.irqCounterHighByte = irq.counter >> 8;
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state->extraData.mapper19.irqCounterEnabled = irq.enabled;
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}
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static void map19_setstate(SnssMapperBlock *state)
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{
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irq.counter = (state->extraData.mapper19.irqCounterHighByte << 8)
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| state->extraData.mapper19.irqCounterLowByte;
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irq.enabled = state->extraData.mapper19.irqCounterEnabled;
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}
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static const map_memwrite map19_memwrite[] =
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{
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{ 0x5000, 0x5FFF, map19_write },
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{ 0x8000, 0xFFFF, map19_write },
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{ -1, -1, NULL }
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};
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const mapintf_t map19_intf =
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{
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19, /* mapper number */
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"Namcot 106", /* mapper name */
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map19_init, /* init routine */
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NULL, /* vblank callback */
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NULL, /* hblank callback */
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map19_getstate, /* get state (snss) */
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map19_setstate, /* set state (snss) */
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NULL, /* memory read structure */
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map19_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: map019.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 1.1.1.1 2001/04/27 07:03:54 neil
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** initial
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**
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** Revision 1.1 2000/10/24 12:19:33 matt
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** changed directory structure
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**
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** Revision 1.6 2000/10/22 19:17:46 matt
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** mapper cleanups galore
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**
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** Revision 1.5 2000/10/21 19:33:38 matt
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** many more cleanups
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**
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** Revision 1.4 2000/10/10 13:58:17 matt
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** stroustrup squeezing his way in the door
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**
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** Revision 1.3 2000/07/15 23:52:20 matt
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** rounded out a bunch more mapper interfaces
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**
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** Revision 1.2 2000/07/06 02:48:43 matt
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** clearly labelled structure members
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**
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** Revision 1.1 2000/07/06 01:01:56 matt
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** initial revision
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**
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*/
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