kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
193 wiersze
4.4 KiB
C
Executable File
193 wiersze
4.4 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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** map16.c
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**
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** mapper 16 interface
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** $Id: map016.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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int counter;
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bool enabled;
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} irq;
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/* mapper 16: Bandai */
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static void map16_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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irq.counter = 0;
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irq.enabled = false;
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}
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static void map16_write(uint32 address, uint8 value)
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{
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int reg = address & 0xF;
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if (reg < 8)
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{
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mmc_bankvrom(1, reg << 10, value);
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}
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else
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{
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switch (address & 0x000F)
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{
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case 0x8:
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mmc_bankrom(16, 0x8000, value);
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break;
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case 0x9:
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switch (value & 3)
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{
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case 0:
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ppu_mirror(0, 0, 1, 1); /* horizontal */
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break;
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case 1:
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ppu_mirror(0, 1, 0, 1); /* vertical */
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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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break;
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case 0xA:
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irq.enabled = (value & 1) ? true : false;
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break;
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case 0xB:
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irq.counter = (irq.counter & 0xFF00) | value;
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break;
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case 0xC:
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irq.counter = (value << 8) | (irq.counter & 0xFF);
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break;
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case 0xD:
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/* eeprom I/O port? */
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break;
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}
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}
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}
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static void map16_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)
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{
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if (0 == --irq.counter)
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nes_irq();
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}
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}
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}
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static void map16_getstate(SnssMapperBlock *state)
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{
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state->extraData.mapper16.irqCounterLowByte = irq.counter & 0xFF;
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state->extraData.mapper16.irqCounterHighByte = irq.counter >> 8;
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state->extraData.mapper16.irqCounterEnabled = irq.enabled;
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}
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static void map16_setstate(SnssMapperBlock *state)
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{
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irq.counter = (state->extraData.mapper16.irqCounterHighByte << 8)
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| state->extraData.mapper16.irqCounterLowByte;
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irq.enabled = state->extraData.mapper16.irqCounterEnabled;
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}
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static const map_memwrite map16_memwrite[] =
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{
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{ 0x6000, 0x600D, map16_write },
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{ 0x7FF0, 0x7FFD, map16_write },
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{ 0x8000, 0x800D, map16_write },
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{ -1, -1, NULL }
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};
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const mapintf_t map16_intf =
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{
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16, /* mapper number */
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"Bandai", /* mapper name */
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map16_init, /* init routine */
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NULL, /* vblank callback */
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map16_hblank, /* hblank callback */
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map16_getstate, /* get state (snss) */
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map16_setstate, /* set state (snss) */
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NULL, /* memory read structure */
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map16_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: map016.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 1.8 2000/10/22 19:17:46 matt
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** mapper cleanups galore
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**
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** Revision 1.7 2000/10/22 15:03:13 matt
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** simplified mirroring
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**
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** Revision 1.6 2000/10/21 19:33:38 matt
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** many more cleanups
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**
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** Revision 1.5 2000/10/10 13:58:16 matt
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** stroustrup squeezing his way in the door
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**
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** Revision 1.4 2000/08/16 02:50:11 matt
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** random mapper cleanups
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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 2000/07/11 05:03:49 matt
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** value masking isn't necessary for the banking routines
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**
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** Revision 1.1 2000/07/11 03:14:18 melanson
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** Initial commit for mappers 16, 34, and 231
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**
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**
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*/
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