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/* fdd.h: Routines for emulating floppy disk drives
Copyright (c) 2007-2016 Gergely Szasz, Philip Kendall
Copyright (c) 2015 Stuart Brady
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
*/
#ifndef FUSE_FDD_H
#define FUSE_FDD_H
#include "event.h"
#include "disk.h"
typedef enum fdd_error_t {
FDD_OK = 0,
FDD_GEOM,
FDD_DATA,
FDD_RDONLY,
FDD_NONE, /* FDD not exist (disabled) */
FDD_LAST_ERROR,
} fdd_error_t;
typedef enum fdd_type_t {
FDD_TYPE_NONE = 0, /* FDD not exist/disabled */
FDD_SHUGART, /* head load when selected */
/*
.. In a single drive system (program shunt position
"MX" shorted), with program shunt position "HL"
shorted, Drive Select when activated to a logical
zero level, will load the R/W head against the
diskette enabling contact of the R/W head against
the media. ...
In a multiple drive system (program shunt position
"MX" open), the three input lines (Drive Select 1,
Drive Select 2 and Drive select 3) are provided so
that the using system may select which drive on
the interface is to be used. In this mode of opera-
tion only the drive with its Drive Select line active
will respond to the input lines and gate the output
lines. In addition, the selected drive will load its
R/W head if program shunt position "HL" is
shorted. ...
*/
FDD_IBMPC,
} fdd_type_t;
typedef enum fdd_dir_t {
FDD_STEP_OUT = 0,
FDD_STEP_IN = 1,
} fdd_dir_t;
typedef struct fdd_t {
fdd_type_t type; /* fdd type: Shugart or IBMPC */
int auto_geom; /* change geometry according to loading disk */
int fdd_heads; /* 1 or 2 */
int fdd_cylinders; /* 40/40+/80/80+ */
int tr00; /* track 0 mark */
int index; /* index hole */
int wrprot; /* write protect */
int data; /* read/write to data byte 0x00nn or 0xffnn */
int marks; /* read/write other marks 0x01 -> FM 0x02 -> WEAK */
disk_t disk; /* disk */
int loaded; /* disk loaded */
int upsidedown; /* flipped disk */
int selected; /* Drive Select line active */
int ready; /* some disk drive offer a ready signal */
int dskchg; /* disk change signal */
int hdout; /* High Density signal */
fdd_error_t status;
/* WD/FD 177X may wait for an index or RDY->/RDY or /RDY->RDY
we do not need more, just a subroutine and a pointer to fdc_struct
*/
void ( *fdc_index ) ( void *fdc );
void *fdc; /* if not NULL FDC wait for an index pulse */
/*--private section, fdc may never use it */
int unreadable; /* disk unreadable in this drive */
int do_read_weak;
int c_head; /* current head (side) */
int c_cylinder; /* current cylinder number (0 -> TR00) */
int c_bpt; /* current track length in bytes */
int motoron; /* motor on */
int loadhead; /* head loaded */
int index_pulse; /* 'second' index hole, for index status */
} fdd_t;
typedef struct fdd_params_t {
int enabled;
int heads;
int cylinders;
} fdd_params_t;
extern const fdd_params_t fdd_params[];
void fdd_register_startup( void );
const char *fdd_strerror( int error );
/* initialize the fdd_t struct, and set fdd_heads and cylinders (e.g. 2/83 ) */
int fdd_init( fdd_t *d, fdd_type_t type, const fdd_params_t *dt, int reinit );
/* load the given disk into the fdd. if upsidedown = 1, floppy upsidedown in drive :) */
int fdd_load( fdd_t *d, int upsidedown );
/* unload the disk from fdd */
void fdd_unload( fdd_t *d );
/* set fdd head */
void fdd_set_head( fdd_t *d, int head );
/* step one track according to d->direction direction. set d->tr00 if reach track 0 */
void fdd_step( fdd_t *d, fdd_dir_t direction );
/* set floppy position ( upsidedown or not )*/
void fdd_motoron( fdd_t *d, int on );
/* start (1) or stop (0) spindle motor */
void fdd_head_load( fdd_t *d, int load );
/* load (1) or unload (0) head */
void fdd_select( fdd_t *d, int select );
/* select (1) or unselect (0) FDD */
void fdd_flip( fdd_t *d, int upsidedown );
/* Read the next byte from disk. The byte will go into d->data.
If d->data = 0xffnn then this byte was recorded with different clock 'mark'.
d->idx is set if we reach the 'index hole'. 0x0100 is read if the disk is
unreadable, the motor is not on, or the head is not loaded.
*/
int fdd_read_data( fdd_t *d );
/* Write the next byte to disk. The byte is taken from d->data.
If d->data = 0xffnn then this byte recorded with different clock 'mark'.
d->idx is set if we reach the 'index hole'.
*/
int fdd_write_data( fdd_t *d );
/* set write protect status on loaded disk */
void fdd_wrprot( fdd_t *d, int wrprot );
/* to reach index hole */
void fdd_wait_index_hole( fdd_t *d );
/* set floppy position ( upsidedown or not )*/
void fdd_flip( fdd_t *d, int upsidedown );
#endif /* FUSE_FDD_H */
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