MT(4) OpenBSD Programmer's Manual (VAX) MT(4)NAMEmt - TM78/ TU-78 MASSBUS magtape interface
SYNOPSIS
mt* at mscpbus? drive?
DESCRIPTION
The TM78/ TU-78 combination provides a standard tape drive interface as
described in mtio(4). Only 1600 and 6250 BPI are supported; the TU-78
runs at 125 IPS and autoloads tapes.
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 terminal 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 terminal 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 bn; 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.
SEE ALSOmt(1), intro(4), mscpbus(4)HISTORY
The mt driver appeared in 4.1BSD.
BUGS
If a physical error (non-data) occurs, mt may hang ungracefully.
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.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9
