Program:	ST.EXE

Description:	ST is a SCSI tape utility program for DOS.  It is intended for
		use with 9-track tapes or anything that acts like one -- 4mm
		DAT, 8mm (sort of), DLT, or DEC TZ30 or TK50Z-GA drives.  It
		requires a DOS ASPI driver for talking to the SCSI port (e.g.
		ASPI8XX.SYS for Symbios 53C8xx based controllers, or
		ASPI8DOS.SYS for Adaptec AIC-78xx based ones such as the
		AHA2940xx).

		The commands are mostly a subset of the commands of the UNIX
		"mt" program.  You can get a list by just typing "ST".  Each
		command generally translates directly to one SCSI command, so
		this program is intended for simple dinking around (actually
		I wrote it just as a demo), nothing fancy.  The only
		complicated commands are IGET and IPUT, which get a tape into
		an image file, or put an image file onto a tape.  These are
		intended for transferring between Ersatz-11's image file
		format and actual tapes.

Commands:	The command line is as follows:

		st [-f device] operation

		The operation is a single tape operation from the list below.
		The optional device name identifies the SCSI tape drive to be
		accessed (see "Devices" below).

		BSF [n]		backspace file(s)

		BSR [n]		backspace record(s)

		FSF [n]		forward space file(s)

		FSR [n]		forward space record(s)

		IGET file [n]	get tape into image file (n=reclen, 0 or none
				if variable)

		IPUT file [n]	put image file onto tape (n=reclen as above)

		READ		read (and toss) a record

		REWIND		rewind tape

		UNLOAD		unload (rewind/unthread/eject/etc.) tape

		WBUF [n]	enable(1)/disable(0) write buffering
				(must be enabled for TZ30, firmware bugs will
				cause write errors otherwise)

		WEOF [n]	write EOF mark(s)

		WRITE		write 512-byte record of ASCII As

Image files:	The image file format used for IGET and IPUT (with no record
		length specified, i.e. variable length) is as follows:

		Normal tape record:

			.long	len	;record length, LSB first
					;N.B. *not* padded to longword boundary
			.blkb	len	;actual record data
			.long	len	;length again, for backspacing

		Tape mark:

			.long	0	;looks the same backwards
					;so no need to repeat it

Devices:	The tape unit to use is specified either with the "-f <dev>"
		command line flag, or using the TAPE environment variable.  In
		either case the device name format is as follows:

			SCSIht_l:

		With the following defnitions of h, t, and l:

		h	host adapter letter, A=first (default), B=second, ...
		t	SCSI target ID (0-15), default=0
		l	SCSI LUN (0-7), default=0 (leave out the _ if using
			the default)

		So for example, "SCSIB6_2:" would refer to target 6, LUN 2, on
		the second SCSI adapter.  But in practice the default values
		are almost always appropriate for h and l, so they may be
		omitted.  For example, "SCSI2:" refers to SCSI target 2, LUN 0
		on the first (or only) SCSI adapter.  The "-f" switch overrides
		the TAPE environment variable.  If neither is specified,
		"SCSI0:" is used by default.

		Note:  D Bit, E11, and Ersatz-11 and trademarks of Digby's
		Bitpile, Inc.  All other trademarks are used for identification
		purposes only and are the property of their respective owners.

Release:	V1.1, 15-Jun-2001

Author:		John Wilson <wilson@dbit.com>

		ST is copyrighted, but may be freely distributed as long as the
		source code is included with the disclaimer and copyright
		notice intact.