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

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MT(4)               UNIX Programmer's Manual                MT(4)



NAME
     mt - TM78/TU-78 MASSBUS magtape interface

SYNOPSIS
     master mt0 at mba? drive ?
     tape mu0 at mt0 slave 0

DESCRIPTION
     The tm78/tu-78 combination provides a standard tape drive
     interface as described in _m_t_i_o(4).  Only 1600 and 6250 bpi
     are supported; the TU-78 runs at 125 ips and autoloads
     tapes.

SEE ALSO
     mt(1), tar(1), tp(1), mtio(4), tm(4), ts(4), ut(4)

DIAGNOSTICS
     mu%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.

     mu%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.

     mu%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.

     mu%d: hard error bn%d mbsr=%b er=%x ds=%b.   A tape error
     occurred at block _b_n; the mt 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.

     mu%d: blank tape.  An attempt was made to read a blank tape
     (a tape without even end-of-file marks).

     mu%d: offline.  During an i/o operation the device was set
     offline.  If a non-raw tape was used in the access it is
     closed.

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

     Because 800 bpi tapes are not supported, the numbering of
     minor devices is inconsistent with triple-density tape
     units.  Unit 0 is drive 0, 1600 bpi.



Printed 12/27/86          June 1, 1986                          1