UT(4)

NAME
ut - UNIBUS TU45 tri-density tape drive interface

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

DESCRIPTION
NOTE: This driver has not been ported from 4.4BSD yet.

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 reasonable 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 message, 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.