kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
327 wiersze
7.1 KiB
C
Executable File
327 wiersze
7.1 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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** map5.c
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**
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** mapper 5 interface
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** $Id: map005.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 "mmc5_snd.h"
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/* TODO: there's lots of info about this mapper now;
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** let's implement it correctly/completely
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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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int reset, latch;
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} irq;
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/* MMC5 - Castlevania III, etc */
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static void map5_hblank(int vblank)
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{
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UNUSED(vblank);
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if (irq.counter == nes_getcontextptr()->scanline)
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{
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if (true == irq.enabled)
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{
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nes_irq();
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irq.reset = true;
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}
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//else
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// irq.reset = false;
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irq.counter = irq.latch;
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}
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}
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static void map5_write(uint32 address, uint8 value)
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{
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static int page_size = 8;
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/* ex-ram memory-- bleh! */
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if (address >= 0x5C00 && address <= 0x5FFF)
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return;
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switch (address)
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{
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case 0x5100:
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/* PRG page size setting */
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/* 0:32k 1:16k 2,3:8k */
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switch (value & 3)
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{
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case 0:
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page_size = 32;
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break;
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case 1:
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page_size = 16;
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break;
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case 2:
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case 3:
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page_size = 8;
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break;
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}
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break;
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case 0x5101:
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/* CHR page size setting */
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/* 0:8k 1:4k 2:2k 3:1k */
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break;
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case 0x5104:
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/* GFX mode setting */
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/*
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00:split mode
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01:split & exgraffix
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10:ex-ram
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11:exram + write protect
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*/
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break;
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case 0x5105:
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/* TODO: exram needs to fill in nametables 2-3 */
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ppu_mirror(value & 3, (value >> 2) & 3, (value >> 4) & 3, value >> 6);
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break;
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case 0x5106:
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case 0x5107:
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/* ex-ram fill mode stuff */
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break;
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case 0x5113:
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/* ram page for $6000-7FFF? bit 2*/
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break;
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case 0x5114:
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mmc_bankrom(8, 0x8000, value);
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//if (page_size == 8)
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// mmc_bankrom(8, 0x8000, value);
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break;
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case 0x5115:
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mmc_bankrom(8, 0x8000, value);
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mmc_bankrom(8, 0xA000, value + 1);
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//if (page_size == 8)
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// mmc_bankrom(8, 0xA000, value);
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//else if (page_size == 16)
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// mmc_bankrom(16, 0x8000, value >> 1);
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//mmc_bankrom(16, 0x8000, value & 0xFE);
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break;
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case 0x5116:
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mmc_bankrom(8, 0xC000, value);
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//if (page_size == 8)
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// mmc_bankrom(8, 0xC000, value);
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break;
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case 0x5117:
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//if (page_size == 8)
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// mmc_bankrom(8, 0xE000, value);
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//else if (page_size == 16)
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// mmc_bankrom(16, 0xC000, value >> 1);
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//mmc_bankrom(16, 0xC000, value & 0xFE);
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//else if (page_size == 32)
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// mmc_bankrom(32, 0x8000, value >> 2);
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//mmc_bankrom(32, 0x8000, value & 0xFC);
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break;
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case 0x5120:
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mmc_bankvrom(1, 0x0000, value);
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break;
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case 0x5121:
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mmc_bankvrom(1, 0x0400, value);
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break;
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case 0x5122:
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mmc_bankvrom(1, 0x0800, value);
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break;
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case 0x5123:
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mmc_bankvrom(1, 0x0C00, value);
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break;
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case 0x5124:
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case 0x5125:
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case 0x5126:
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case 0x5127:
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/* more VROM shit? */
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break;
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case 0x5128:
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mmc_bankvrom(1, 0x1000, value);
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break;
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case 0x5129:
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mmc_bankvrom(1, 0x1400, value);
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break;
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case 0x512A:
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mmc_bankvrom(1, 0x1800, value);
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break;
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case 0x512B:
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mmc_bankvrom(1, 0x1C00, value);
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break;
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case 0x5203:
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irq.counter = value;
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irq.latch = value;
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// irq.reset = false;
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break;
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case 0x5204:
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irq.enabled = (value & 0x80) ? true : false;
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// irq.reset = false;
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break;
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default:
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#ifdef NOFRENDO_DEBUG
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log_printf("unknown mmc5 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 uint8 map5_read(uint32 address)
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{
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/* Castlevania 3 IRQ counter */
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if (address == 0x5204)
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{
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/* if reset == 1, we've hit scanline */
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return (irq.reset ? 0x40 : 0x00);
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}
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else
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{
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#ifdef NOFRENDO_DEBUG
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log_printf("invalid MMC5 read: $%04X", address);
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#endif
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return 0xFF;
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}
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}
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static void map5_init(void)
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{
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mmc_bankrom(8, 0x8000, MMC_LASTBANK);
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mmc_bankrom(8, 0xA000, MMC_LASTBANK);
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mmc_bankrom(8, 0xC000, MMC_LASTBANK);
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mmc_bankrom(8, 0xE000, MMC_LASTBANK);
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irq.counter = irq.enabled = 0;
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irq.reset = irq.latch = 0;
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}
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/* incomplete SNSS definition */
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static void map5_getstate(SnssMapperBlock *state)
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{
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state->extraData.mapper5.dummy = 0;
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}
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static void map5_setstate(SnssMapperBlock *state)
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{
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UNUSED(state);
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}
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static map_memwrite map5_memwrite[] =
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{
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/* $5000 - $5015 handled by sound */
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{ 0x5016, 0x5FFF, map5_write },
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{ 0x8000, 0xFFFF, map5_write },
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{ -1, -1, NULL }
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};
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static map_memread map5_memread[] =
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{
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{ 0x5204, 0x5204, map5_read },
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{ -1, -1, NULL }
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};
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mapintf_t map5_intf =
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{
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5, /* mapper number */
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"MMC5", /* mapper name */
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map5_init, /* init routine */
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NULL, /* vblank callback */
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map5_hblank, /* hblank callback */
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map5_getstate, /* get state (snss) */
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map5_setstate, /* set state (snss) */
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map5_memread, /* memory read structure */
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map5_memwrite, /* memory write structure */
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&mmc5_ext /* external sound device */
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};
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/*
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** $Log: map005.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 1.2 2000/11/25 20:32:33 matt
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** scanline interface change
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**
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** Revision 1.1 2000/10/24 12:19:32 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 2000/10/21 19:33:37 matt
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** many more cleanups
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**
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** Revision 1.9 2000/10/17 03:23:16 matt
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** added mmc5 sound interface
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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 2000/08/16 02:50:11 matt
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** random mapper cleanups
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**
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** Revision 1.6 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 1.5 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 1.4 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 1.3 2000/07/06 02:48:43 matt
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** clearly labelled structure members
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**
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** Revision 1.2 2000/07/05 05:04:51 matt
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** fixed h-blank callback
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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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