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/* upd_fdc.h: NEC floppy disk controller emulation
Copyright (c) 2003-2010 Stuart Brady, Fredrick Meunier, Philip Kendall,
Gergely Szasz
$Id: upd_fdc.h 4636 2012-01-20 14:07:15Z pak21 $
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
Philip: philip-fuse@shadowmagic.org.uk
Stuart: stuart.brady@gmail.com
*/
#ifndef FUSE_UPD_FDC_H
#define FUSE_UPD_FDC_H
#include <libspectrum.h>
#include "event.h"
#include "fdd.h"
#include "fuse.h"
typedef enum upd_type_t {
UPD765A = 0,
UPD765B,
} upd_type_t;
typedef enum upd_clock_t {
UPD_CLOCK_4MHZ = 0,
UPD_CLOCK_8MHZ,
} upd_clock_t;
typedef enum upd_scan_t {
UPD_SCAN_EQ = 0,
UPD_SCAN_LO,
UPD_SCAN_HI,
} upd_scan_t;
typedef enum upd_cmd_id_t {
/* ----v computer READ at execution phase*/
UPD_CMD_READ_DATA = 0, /* (non)deleted */
UPD_CMD_READ_DIAG,
/* ----v computer WRITE at execution phase*/
UPD_CMD_WRITE_DATA, /* (non)deleted */
UPD_CMD_WRITE_ID, /* :) format */
UPD_CMD_SCAN, /* equal/low-or-equal/high-or-equal */
/* ----v NO data transfer at execution phase */
UPD_CMD_READ_ID,
/* ----v NO RW head contact */
UPD_CMD_RECALIBRATE,
UPD_CMD_SENSE_INT,
UPD_CMD_SPECIFY,
UPD_CMD_SENSE_DRIVE,
UPD_CMD_VERSION,
UPD_CMD_SEEK,
UPD_CMD_INVALID,
} upd_cmd_id_t;
typedef struct upd_cmd_t {
upd_cmd_id_t id; /* command ID */
libspectrum_byte mask; /* && mask */
libspectrum_byte value; /* == value */
int cmd_length; /* command length */
int res_length; /* result length */
} upd_cmd_t;
typedef enum upd_intrq_t {
UPD_INTRQ_NONE = 0,
UPD_INTRQ_RESULT,
UPD_INTRQ_EXE,
UPD_INTRQ_READY,
UPD_INTRQ_SEEK,
} upd_intrq_t;
typedef struct upd_fdc_drive {
fdd_t fdd; /* floppy disk drive */
disk_t disk; /* the floppy disk itself */
} upd_fdc_drive;
typedef struct upd_fdc {
upd_fdc_drive *current_drive;
upd_fdc_drive *drive[4]; /* UPD765 control 4 drives */
upd_type_t type; /* UPD765A UPD765B */
upd_clock_t clock; /* clock rate ( 4/8 MHz ) */
int stp_rate; /* stepping rate ms */
int hut_time; /* head unload time ms */
int hld_time; /* head load time ms */
int non_dma; /* operating mode */
int first_rw; /* first sector alway read/write even EOT < R */
int spin_cycles;
fdd_dir_t direction; /* 0 = spindlewards, 1 = rimwards */
upd_intrq_t intrq; /* last INTRQ status */
int datarq; /* DRQ line status */
enum upd_fdc_state {
UPD_FDC_STATE_CMD = 0,
UPD_FDC_STATE_EXE,
UPD_FDC_STATE_RES,
} state;
int id_track;
int id_head;
int id_sector;
int id_length; /* sector length code 0, 1, 2, 3 */
int sector_length; /* sector length from length code */
int ddam; /* read a deleted data mark */
int rev; /* revolution counter */
int head_load; /* head state */
int read_id; /* searching an IDAM */
enum upd_fdc_am_type {
UPD_FDC_AM_NONE = 0,
UPD_FDC_AM_ID,
} id_mark;
unsigned int last_sector_read;/* for Speedlock 'random' sector hack */
int speedlock; /* for Speedlock 'random' sector hack, -1 -> disable */
/* state during transfer */
int data_offset;
int cycle; /* read/write cycle num */
int del_data; /* READ/WRITE deleted data */
int mt; /* multitrack operations */
int mf; /* MFM mode */
int sk; /* skip deleted/not deleted data */
int hd; /* physical head address */
int us; /* unit select 0-3 */
int pcn[4]; /* present cylinder numbers */
int ncn[4]; /* new cylinder numbers */
int rec[4]; /* recalibrate store pcns */
int seek[4]; /* seek status for 4 drive */
int rlen; /* expected record length */
upd_scan_t scan; /* SCAN type: eq/lo/hi */
upd_cmd_t *cmd; /* current command */
libspectrum_byte command_register; /* command register */
libspectrum_byte data_register[9]; /* data registers */
libspectrum_byte main_status; /* main status register */
libspectrum_byte status_register[4]; /* status registers */
libspectrum_byte sense_int_res[2]; /* result bytes for SENSE INTERRUPT */
libspectrum_word crc; /* to hold crc */
void ( *set_intrq ) ( struct upd_fdc *f );
void ( *reset_intrq ) ( struct upd_fdc *f );
void ( *set_datarq ) ( struct upd_fdc *f );
void ( *reset_datarq ) ( struct upd_fdc *f );
} upd_fdc;
void upd_fdc_init_events( void );
/* allocate an fdc */
upd_fdc *upd_fdc_alloc_fdc( upd_type_t type, upd_clock_t clock );
void upd_fdc_master_reset( upd_fdc *f );
libspectrum_byte upd_fdc_read_status( upd_fdc *f );
libspectrum_byte upd_fdc_read_data( upd_fdc *f );
void upd_fdc_write_data( upd_fdc *f, libspectrum_byte b );
#endif /* #ifndef FUSE_UPD_FDC_H */
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