1.\" Copyright (c) 1980, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)mt.4 6.4 (Berkeley) 3/27/91 33.\" $Id: mt.4,v 1.2 1993/08/01 07:36:08 mycroft Exp $ 34.\" 35.Dd March 27, 1991 36.Dt MT 4 vax 37.Os BSD 4 38.Sh NAME 39.Nm mt 40.Nd 41.Tn TM78 Ns / Tn TU-78 42.Tn MASSBUS 43magtape interface 44.Sh SYNOPSIS 45.Cd "master mt0 at mba? drive ? tape mu0 at mt0 slave 0" 46.Sh DESCRIPTION 47The 48.Tn TM78 Ns / Tn TU-78 49combination provides a standard tape drive 50interface as described in 51.Xr mtio 4 . 52Only 1600 and 6250 53.Tn BPI 54are supported; the 55.Tn TU-78 56runs at 125 57.Tn IPS 58and autoloads tapes. 59.Sh DIAGNOSTICS 60.Bl -diag 61.It mu%d: no write ring. 62An attempt was made to write on the tape drive 63when no write ring was present; this message is written on the terminal of 64the user who tried to access the tape. 65.Pp 66.It mu%d: not online. 67An attempt was made to access the tape while it 68was offline; this message is written on the terminal of the user 69who tried to access the tape. 70.Pp 71.It "mu%d: can't change density in mid-tape." 72An attempt was made to write 73on a tape at a different density than is already recorded on the tape. 74This message is written on the terminal of the user who tried to switch 75the density. 76.Pp 77.It "mu%d: hard error bn%d mbsr=%b er=%x ds=%b." 78A tape error occurred 79at block 80.Em bn ; 81the mt error register and drive status register are 82printed in octal with the bits symbolically decoded. Any error is 83fatal on non-raw tape; when possible the driver will have retried 84the operation which failed several times before reporting the error. 85.Pp 86.It mu%d: blank tape. 87An attempt was made to read a blank tape (a tape without even 88end-of-file marks). 89.Pp 90.It mu%d: offline. 91During an i/o operation the device was set offline. If a 92non-raw tape was used in the access it is closed. 93.El 94.Sh SEE ALSO 95.Xr mt 1 , 96.Xr tar 1 , 97.Xr tp 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