kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
236 wiersze
5.0 KiB
C
Executable File
236 wiersze
5.0 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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** map24.c
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**
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** mapper 24 interface
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** $Id: map024.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.h"
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#include "log.h"
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#include "vrcvisnd.h"
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static struct
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{
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int counter, enabled;
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int latch, wait_state;
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} irq;
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static void map24_init(void)
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{
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irq.counter = irq.enabled = 0;
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irq.latch = irq.wait_state = 0;
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}
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static void map24_hblank(int vblank)
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{
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UNUSED(vblank);
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if (irq.enabled)
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{
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if (256 == ++irq.counter)
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{
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irq.counter = irq.latch;
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nes_irq();
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//irq.enabled = false;
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irq.enabled = irq.wait_state;
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}
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}
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}
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static void map24_write(uint32 address, uint8 value)
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{
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switch (address & 0xF003)
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{
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case 0x8000:
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mmc_bankrom(16, 0x8000, value);
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break;
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case 0x9003:
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/* ??? */
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break;
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case 0xB003:
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switch (value & 0x0C)
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{
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case 0x00:
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ppu_mirror(0, 1, 0, 1); /* vertical */
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break;
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case 0x04:
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ppu_mirror(0, 0, 1, 1); /* horizontal */
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break;
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case 0x08:
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ppu_mirror(0, 0, 0, 0);
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break;
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case 0x0C:
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ppu_mirror(1, 1, 1, 1);
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break;
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default:
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break;
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}
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break;
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case 0xC000:
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mmc_bankrom(8, 0xC000, value);
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break;
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case 0xD000:
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mmc_bankvrom(1, 0x0000, value);
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break;
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case 0xD001:
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mmc_bankvrom(1, 0x0400, value);
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break;
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case 0xD002:
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mmc_bankvrom(1, 0x0800, value);
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break;
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case 0xD003:
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mmc_bankvrom(1, 0x0C00, value);
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break;
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case 0xE000:
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mmc_bankvrom(1, 0x1000, value);
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break;
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case 0xE001:
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mmc_bankvrom(1, 0x1400, value);
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break;
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case 0xE002:
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mmc_bankvrom(1, 0x1800, value);
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break;
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case 0xE003:
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mmc_bankvrom(1, 0x1C00, value);
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break;
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case 0xF000:
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irq.latch = value;
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break;
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case 0xF001:
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irq.enabled = (value >> 1) & 0x01;
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irq.wait_state = value & 0x01;
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if (irq.enabled)
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irq.counter = irq.latch;
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break;
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case 0xF002:
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irq.enabled = irq.wait_state;
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break;
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default:
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#ifdef NOFRENDO_DEBUG
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log_printf("invalid VRC6 write: $%02X to $%04X", value, address);
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#endif
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break;
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}
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}
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static void map24_getstate(SnssMapperBlock *state)
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{
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state->extraData.mapper24.irqCounter = irq.counter;
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state->extraData.mapper24.irqCounterEnabled = irq.enabled;
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}
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static void map24_setstate(SnssMapperBlock *state)
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{
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irq.counter = state->extraData.mapper24.irqCounter;
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irq.enabled = state->extraData.mapper24.irqCounterEnabled;
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}
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static const map_memwrite map24_memwrite[] =
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{
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{ 0x8000, 0xF002, map24_write },
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{ -1, -1, NULL }
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};
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mapintf_t const map24_intf =
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{
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24, /* mapper number */
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"Konami VRC6", /* mapper name */
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map24_init, /* init routine */
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NULL, /* vblank callback */
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map24_hblank, /* hblank callback */
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map24_getstate, /* get state (snss) */
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map24_setstate, /* set state (snss) */
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NULL, /* memory read structure */
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map24_memwrite, /* memory write structure */
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&vrcvi_ext /* external sound device */
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};
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/*
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** $Log: map024.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 1.11 2000/10/22 19:17:46 matt
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** mapper cleanups galore
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**
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** Revision 1.10 2000/10/22 15:03:13 matt
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** simplified mirroring
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**
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** Revision 1.9 2000/10/21 19:33:38 matt
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** many more cleanups
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**
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** Revision 1.8 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 1.7 2000/10/09 12:00:53 matt
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** removed old code
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**
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** Revision 1.6 2000/08/16 02:50:11 matt
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** random mapper cleanups
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**
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** Revision 1.5 2000/07/15 23:52:19 matt
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** rounded out a bunch more mapper interfaces
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**
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** Revision 1.4 2000/07/10 13:51:25 matt
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** using generic nes_irq() routine now
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**
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** Revision 1.3 2000/07/10 05:29:03 matt
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** cleaned up some mirroring issues
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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 2000/07/04 23:11:45 matt
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** initial revision
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**
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*/
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