1997-10-19 17:01:13 +04:00
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.\" $NetBSD: mt.4,v 1.4 1997/10/19 13:01:21 mrg Exp $
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1996-03-03 19:54:17 +03:00
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.\"
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1997-10-19 17:01:13 +04:00
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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1993-03-21 12:45:37 +03:00
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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1997-10-19 17:01:13 +04:00
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.\" from: @(#)mt.4 8.1 (Berkeley) 6/5/93
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1993-03-21 12:45:37 +03:00
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.\"
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1997-10-19 17:01:13 +04:00
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.Dd June 5, 1993
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1993-03-21 12:45:37 +03:00
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.Dt MT 4 vax
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.Os BSD 4
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.Sh NAME
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.Nm mt
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.Nd
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.Tn TM78 Ns / Tn TU-78
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.Tn MASSBUS
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magtape interface
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.Sh SYNOPSIS
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.Cd "master mt0 at mba? drive ? tape mu0 at mt0 slave 0"
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.Sh DESCRIPTION
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The
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.Tn TM78 Ns / Tn TU-78
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combination provides a standard tape drive
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interface as described in
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.Xr mtio 4 .
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Only 1600 and 6250
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.Tn BPI
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are supported; the
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.Tn TU-78
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runs at 125
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.Tn IPS
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and autoloads tapes.
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.Sh DIAGNOSTICS
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.Bl -diag
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.It mu%d: no write ring.
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An attempt was made to write on the tape drive
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when no write ring was present; this message is written on the terminal of
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the user who tried to access the tape.
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.Pp
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.It mu%d: not online.
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An attempt was made to access the tape while it
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was offline; this message is written on the terminal of the user
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who tried to access the tape.
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.Pp
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.It "mu%d: can't change density in mid-tape."
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An attempt was made to write
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on a tape at a different density than is already recorded on the tape.
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This message is written on the terminal of the user who tried to switch
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the density.
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.Pp
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.It "mu%d: hard error bn%d mbsr=%b er=%x ds=%b."
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A tape error occurred
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at block
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.Em bn ;
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the mt error register and drive status register are
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printed in octal with the bits symbolically decoded. Any error is
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fatal on non-raw tape; when possible the driver will have retried
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the operation which failed several times before reporting the error.
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.Pp
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.It mu%d: blank tape.
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An attempt was made to read a blank tape (a tape without even
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end-of-file marks).
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.Pp
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.It mu%d: offline.
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During an i/o operation the device was set offline. If a
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non-raw tape was used in the access it is closed.
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.El
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.Sh SEE ALSO
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.Xr mt 1 ,
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.Xr tar 1 ,
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.Xr tp 1 ,
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.Xr mtio 4 ,
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.Xr tm 4 ,
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.Xr ts 4 ,
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.Xr ut 4
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.Sh HISTORY
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The
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.Nm
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driver appeared in
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.Bx 4.1 .
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.Sh BUGS
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If a physical error (non-data) occurs,
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.Nm
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may hang ungracefully.
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.Pp
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Because 800
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.Tn BPI
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tapes are not supported, the numbering of minor devices
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is inconsistent with triple-density tape units.
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Unit 0 is drive 0, 1600
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.Tn BPI.
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