4.3BSD-UWisc/man/cat4/ut.4

UT(4)               UNIX Programmer's 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 _u_t interface provides access to a standard tape drive
     interface as describe in _m_t_i_o(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.

SEE ALSO
     mt(1), mtio(4)

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 termi-
     nal 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 termi-
     nal of the user who tried to switch the density.

     ut%d: soft error bn%d cs1=%b er=%b cs2=%b ds=%b.  The for-
     matter 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 _b_n.  Any error is fatal on non-raw
     tape; when possible the driver will have retried the opera-
     tion 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.

BUGS
     If any non-data error is encountered on non-raw tape, it
     refuses to do anything more until closed.



Printed 12/27/86          May 15, 1985                          1