4.1cBSD/usr/man/man4/mt.4v

.TH MT 4V "1 April 1981"
.UC 4
.SH NAME
mt \- TM78/TU-78 MASSBUS magtape interface
.SH SYNOPSIS
.B master mt0 at mba? drive ?
.br
.B tape mu0 at mt0 slave 0
.SH DESCRIPTION
The tm78/tu-78 combination provides a standard tape drive
interface as described in
.IR mt (4).
Only 1600 and 6250 bpi are supported; the
TU-78 runs at 125 ips and autoloads tapes.
.SH "SEE ALSO"
mt(1),
tar(1),
tp(1),
mt(4),
tm(4V),
ts(4V),
ut(4V)
.SH DIAGNOSTICS
\fBmu%d: no write ring\fR.  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.
.PP
\fBmu%d: not online\fR.  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.
.PP
\fBmu%d: can't switch density in mid-tape\fR.  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.
.PP
\fBmu%d: hard error bn%d mbsr=%b er=%x ds=%b\fR.   A tape error occurred
at block \fIbn\fR; 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.
.PP
\fBmu%d: blank tape\fP.
An attempt was made to read a blank tape (a tape without even
end-of-file marks).
.PP
\fBmu%d: offline\fP.
During an i/o operation the device was set offline.  If a
non-raw tape was used in the access it is closed.
.SH BUGS
If any non-data error is encountered on non-raw tape,
it refuses to do anything more until closed.
.PP
The system should remember which controlling terminal has the tape drive
open and write error messages to that terminal rather than on the console.