kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
233 wiersze
4.9 KiB
C
Executable File
233 wiersze
4.9 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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** map85.c
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**
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** mapper 85 interface
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** $Id: map085.c,v 1.3 2001/05/06 01:42:03 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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static struct
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{
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int counter, latch;
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int wait_state;
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bool enabled;
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} irq;
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/* mapper 85: Konami VRC7 */
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static void map85_write(uint32 address, uint8 value)
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{
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uint8 bank = address >> 12;
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uint8 reg = (address & 0x10) | ((address & 0x08) << 1);
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switch (bank)
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{
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case 0x08:
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if (0x10 == reg)
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mmc_bankrom(8, 0xA000, value);
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else
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mmc_bankrom(8, 0x8000, value);
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break;
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case 0x09:
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/* 0x10 & 0x30 should be trapped by sound emulation */
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mmc_bankrom(8, 0xC000, value);
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break;
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case 0x0A:
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if (0x10 == reg)
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mmc_bankvrom(1, 0x0400, value);
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else
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mmc_bankvrom(1, 0x0000, value);
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break;
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case 0x0B:
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if (0x10 == reg)
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mmc_bankvrom(1, 0x0C00, value);
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else
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mmc_bankvrom(1, 0x0800, value);
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break;
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case 0x0C:
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if (0x10 == reg)
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mmc_bankvrom(1, 0x1400, value);
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else
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mmc_bankvrom(1, 0x1000, value);
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break;
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case 0x0D:
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if (0x10 == reg)
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mmc_bankvrom(1, 0x1C00, value);
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else
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mmc_bankvrom(1, 0x1800, value);
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break;
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case 0x0E:
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if (0x10 == reg)
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{
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irq.latch = value;
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}
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else
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{
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switch (value & 3)
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{
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case 0:
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ppu_mirror(0, 1, 0, 1); /* vertical */
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break;
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case 1:
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ppu_mirror(0, 0, 1, 1); /* horizontal */
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break;
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case 2:
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ppu_mirror(0, 0, 0, 0);
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break;
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case 3:
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ppu_mirror(1, 1, 1, 1);
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break;
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}
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}
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break;
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case 0x0F:
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if (0x10 == reg)
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{
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irq.enabled = irq.wait_state;
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}
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else
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{
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irq.wait_state = value & 0x01;
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irq.enabled = (value & 0x02) ? true : false;
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if (true == irq.enabled)
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irq.counter = irq.latch;
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}
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break;
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default:
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#ifdef NOFRENDO_DEBUG
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log_printf("unhandled vrc7 write: $%02X to $%04X\n", value, address);
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#endif /* NOFRENDO_DEBUG */
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break;
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}
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}
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static void map85_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 (++irq.counter > 0xFF)
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{
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irq.counter = irq.latch;
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nes_irq();
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//return;
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}
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//irq.counter++;
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}
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}
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static const map_memwrite map85_memwrite[] =
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{
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{ 0x8000, 0xFFFF, map85_write },
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{ -1, -1, NULL }
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};
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static void map85_init(void)
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{
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mmc_bankrom(16, 0x8000, 0);
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mmc_bankrom(16, 0xC000, MMC_LASTBANK);
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mmc_bankvrom(8, 0x0000, 0);
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irq.counter = irq.latch = 0;
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irq.wait_state = 0;
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irq.enabled = false;
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}
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const mapintf_t map85_intf =
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{
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85, /* mapper number */
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"Konami VRC7", /* mapper name */
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map85_init, /* init routine */
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NULL, /* vblank callback */
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map85_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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map85_memwrite, /* memory write structure */
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NULL
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};
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/*
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** $Log: map085.c,v $
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** Revision 1.3 2001/05/06 01:42:03 neil
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** boooo
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**
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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 1.10 2000/10/22 19:17:46 matt
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** mapper cleanups galore
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**
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** Revision 1.9 2000/10/22 15:03:14 matt
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** simplified mirroring
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**
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** Revision 1.8 2000/10/21 19:33:38 matt
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** many more cleanups
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**
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** Revision 1.7 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 1.6 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 2000/07/23 14:37:21 matt
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** added a break statement
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**
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** Revision 1.4 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 1.3 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 1.2 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 1.1 2000/07/06 02:47:47 matt
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** initial revision
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**
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*/
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