ut man page on 4.4BSD

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UT(4)		       BSD/vax Kernel Interfaces Manual			 UT(4)

NAME
     ut — UNIBUS TU45 tri-density tape drive interface

SYNOPSIS
     controller ut0 at uba0 csr 0172440 vector utintr
     tape tj0 at ut0 drive 0

DESCRIPTION
     The ut interface provides access to a standard tape drive interface as
     describe in mtio(4).  Hardware implementing this on the VAX is typified
     by the System Industries SI 9700 tape subsystem.  Tapes may be read or
     written at 800, 1600, and 6250 BPI.

DIAGNOSTICS
     tj%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.

     tj%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.

     tj%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.

     ut%d: soft error bn%d cs1=%b er=%b cs2=%b ds=%b.  The formatter indicated
     a corrected error at a density other than 800bpi.	The data transferred
     is assumed to be correct.

     ut%d: hard error bn%d cs1=%b er=%b cs2=%b ds=%b.  A tape error occurred
     at block

     bn.  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.

     tj%d: lost interrupt.  A tape operation did not complete within a reason‐
     able time, most likely because the tape was taken off-line during rewind
     or lost vacuum.  The controller should, but does not, give an interrupt
     in these cases.  The device will be made available again after this mes‐
     sage, but any current open reference to the device will return an error
     as the operation in progress aborts.

SEE ALSO
     mt(1), mtio(4)

HISTORY
     The ut driver appeared in 4.2BSD.

BUGS
     May hang if a physical error (non-data) occurs.

4.2 Berkeley Distribution	 June 5, 1993	     4.2 Berkeley Distribution
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