1.\" $NetBSD: mt.4,v 1.8 2002/01/15 02:09:19 wiz Exp $ 2.\" 3.\" Copyright (c) 1980, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" from: @(#)mt.4 8.1 (Berkeley) 6/5/93 35.\" 36.Dd June 5, 1993 37.Dt MT 4 vax 38.Os 39.Sh NAME 40.Nm mt 41.Nd 42.Tn TM78 Ns / Tn TU-78 43.Tn MASSBUS 44mag tape interface 45.Sh SYNOPSIS 46.Cd "mt0 at mba? drive ? tape mu0 at mt0 slave 0" 47.Sh DESCRIPTION 48The 49.Tn TM78 Ns / Tn TU-78 50combination provides a standard tape drive 51interface as described in 52.Xr mtio 4 . 53Only 1600 and 6250 54.Tn BPI 55are supported; the 56.Tn TU-78 57runs at 125 58.Tn IPS 59and autoloads tapes. 60.Sh DIAGNOSTICS 61.Bl -diag 62.It mu%d: no write ring. 63An attempt was made to write on the tape drive 64when no write ring was present; this message is written on the terminal of 65the user who tried to access the tape. 66.Pp 67.It mu%d: not online. 68An attempt was made to access the tape while it 69was offline; this message is written on the terminal of the user 70who tried to access the tape. 71.Pp 72.It "mu%d: can't change density in mid-tape." 73An attempt was made to write 74on a tape at a different density than is already recorded on the tape. 75This message is written on the terminal of the user who tried to switch 76the density. 77.Pp 78.It "mu%d: hard error bn%d mbsr=%b er=%x ds=%b." 79A tape error occurred 80at block 81.Em bn ; 82the mt error register and drive status register are 83printed in octal with the bits symbolically decoded. Any error is 84fatal on non-raw tape; when possible the driver will have retried 85the operation which failed several times before reporting the error. 86.Pp 87.It mu%d: blank tape. 88An attempt was made to read a blank tape (a tape without even 89end-of-file marks). 90.Pp 91.It mu%d: offline. 92During an i/o operation the device was set offline. If a 93non-raw tape was used in the access it is closed. 94.El 95.Sh SEE ALSO 96.Xr mt 1 , 97.Xr tar 1 , 98.Xr mtio 4 , 99.Xr tm 4 , 100.Xr ts 4 , 101.Xr ut 4 102.Sh HISTORY 103The 104.Nm 105driver appeared in 106.Bx 4.1 . 107.Sh BUGS 108If a physical error (non-data) occurs, 109.Nm 110may hang ungracefully. 111.Pp 112Because 800 113.Tn BPI 114tapes are not supported, the numbering of minor devices 115is inconsistent with triple-density tape units. 116Unit 0 is drive 0, 1600 117.Tn BPI . 118