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.\"     from: @(#)ht.4	8.1 (Berkeley) 6/5/93
.\"
.Dd February 17, 2017
.Dt HT 4 vax
.Os
.Sh NAME
.Nm ht
.Nd
.Tn TM-03 Ns / Tn TE-16 ,
.Tn TU-45 ,
.Tn TU-77
.Tn MASSBUS
mag tape device interface:
.Sh SYNOPSIS
.Cd "ht0 at mba? drive ?"
.Cd "tu0 at ht0 slave 0"
.Sh DESCRIPTION
NOTE: This driver has not been ported from
.Bx 4.4
yet.
.Pp
The
.Tn TM-03
transport combination provides a standard tape drive
interface as described in
.Xr vax/mtio 4 .
All drives provide both 800 and 1600
.Tn BPI ;
the
.Tn TE-16
runs at 45
.Tn IPS ,
the
.Tn TU-45
at 75
.Tn IPS ,
while the
.Tn TU-77
runs at 125
.Tn IPS
and autoloads tapes.
.Sh DIAGNOSTICS
.Bl -diag
.It tu%d: no write ring.
An attempt was made to write on the tape drive
when no write ring was present; this message is written on the terminal of
the user who tried to access the tape.
.It tu%d: not online.
An attempt was made to access the tape while it
was offline; this message is written on the terminal of the user
who tried to access the tape.
.It tu%d: can't change density in mid-tape.
An attempt was made to write
on a tape at a different density than is already recorded on the tape.
This message is written on the terminal of the user who tried to switch
the density.
.It "tu%d: hard error bn%d mbsr=%b er=%b ds=%b."
A tape error occurred
at block
.Em bn ;
the ht error register and drive status register are
printed in octal with the bits symbolically decoded.
Any error is
fatal on non-raw tape; when possible the driver will have retried
the operation which failed several times before reporting the error.
.El
.Sh SEE ALSO
.Xr tar 1 ,
.Xr vax/mt 1 ,
.Xr physio 4 ,
.Xr vax/mt 4 ,
.Xr vax/mtio 4 ,
.Xr vax/tm 4 ,
.Xr vax/ts 4 ,
.Xr vax/ut 4
.Sh HISTORY
An
.Nm
driver appeared in
.At v6 .
.Sh BUGS
May hang if physical (non-data) errors occur.