1.\" Copyright (c) 1980, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)mt.4 6.4 (Berkeley) 03/27/91 7.\" 8.Dd 9.Dt MT 4 vax 10.Os BSD 4 11.Sh NAME 12.Nm mt 13.Nd 14.Tn TM78 Ns / Tn TU-78 15.Tn MASSBUS 16magtape interface 17.Sh SYNOPSIS 18.Cd "master mt0 at mba? drive ? tape mu0 at mt0 slave 0" 19.Sh DESCRIPTION 20The 21.Tn TM78 Ns / Tn TU-78 22combination provides a standard tape drive 23interface as described in 24.Xr mtio 4 . 25Only 1600 and 6250 26.Tn BPI 27are supported; the 28.Tn TU-78 29runs at 125 30.Tn IPS 31and autoloads tapes. 32.Sh DIAGNOSTICS 33.Bl -diag 34.It mu%d: no write ring. 35An attempt was made to write on the tape drive 36when no write ring was present; this message is written on the terminal of 37the user who tried to access the tape. 38.Pp 39.It mu%d: not online. 40An attempt was made to access the tape while it 41was offline; this message is written on the terminal of the user 42who tried to access the tape. 43.Pp 44.It "mu%d: can't change density in mid-tape." 45An attempt was made to write 46on a tape at a different density than is already recorded on the tape. 47This message is written on the terminal of the user who tried to switch 48the density. 49.Pp 50.It "mu%d: hard error bn%d mbsr=%b er=%x ds=%b." 51A tape error occurred 52at block 53.Em bn ; 54the mt error register and drive status register are 55printed in octal with the bits symbolically decoded. Any error is 56fatal on non-raw tape; when possible the driver will have retried 57the operation which failed several times before reporting the error. 58.Pp 59.It mu%d: blank tape. 60An attempt was made to read a blank tape (a tape without even 61end-of-file marks). 62.Pp 63.It mu%d: offline. 64During an i/o operation the device was set offline. If a 65non-raw tape was used in the access it is closed. 66.El 67.Sh SEE ALSO 68.Xr mt 1 , 69.Xr tar 1 , 70.Xr tp 1 , 71.Xr mtio 4 , 72.Xr tm 4 , 73.Xr ts 4 , 74.Xr ut 4 75.Sh HISTORY 76The 77.Nm 78driver appeared in 79.Bx 4.1 . 80.Sh BUGS 81If a physical error (non-data) occurs, 82.Nm 83may hang ungracefully. 84.Pp 85Because 800 86.Tn BPI 87tapes are not supported, the numbering of minor devices 88is inconsistent with triple-density tape units. 89Unit 0 is drive 0, 1600 90.Tn BPI. 91