BSD 4_2 development

Work on file usr/man/man4/mt.4

Synthesized-from: CSRG/cd1/4.2

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+.TH MT 4 "27 July 1983"
+.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 mtio (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),
+mtio(4),
+tm(4),
+ts(4),
+ut(4)
+.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.