MT
Section: Devices and Network Interfaces (4)
Updated: vax
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BSD mandoc
BSD 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
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 ALSO
mt(1),
tar(1),
tp(1),
mtio(4),
tm(4),
ts(4),
ut(4)
HISTORY
The
driver appeared in
BSD 4.1
BUGS
If a physical error (non-data) occurs,
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.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- DIAGNOSTICS
-
- SEE ALSO
-
- HISTORY
-
- BUGS
-
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Time: 06:48:33 GMT, May 19, 2025