1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)ut.4 8.1 (Berkeley) 06/05/93 7.\" 8.Dd 9.Dt UT 4 vax 10.Os BSD 4.2 11.Sh NAME 12.Nm ut 13.Nd 14.Tn UNIBUS TU45 15tri-density tape drive interface 16.Sh SYNOPSIS 17.Cd "controller ut0 at uba0 csr 0172440 vector utintr" 18.Cd "tape tj0 at ut0 drive 0" 19.Sh DESCRIPTION 20The 21.Nm ut 22interface provides access to a standard tape drive interface as 23describe in 24.Xr mtio 4 . 25Hardware implementing this on the 26.Tn VAX 27is typified by the System 28Industries 29.Tn SI 309700 tape subsystem. Tapes may be read or written 31at 800, 1600, and 6250 32.Tn BPI . 33.Sh DIAGNOSTICS 34.Bl -diag 35.It tj%d: no write ring. 36An attempt was made to write on the tape drive 37when no write ring was present; this message is written on the terminal of 38the user who tried to access the tape. 39.Pp 40.It tj%d: not online. 41An attempt was made to access the tape while it 42was offline; this message is written on the terminal of the user 43who tried to access the tape. 44.Pp 45.It tj%d: can't change density in mid-tape. 46An attempt was made to write 47on a tape at a different density than is already recorded on the tape. 48This message is written on the terminal of the user who tried to switch 49the density. 50.Pp 51.It "ut%d: soft error bn%d cs1=%b er=%b cs2=%b ds=%b." 52The formatter indicated a corrected error at a density other 53than 800bpi. The data transferred is assumed to be correct. 54.Pp 55.It "ut%d: hard error bn%d cs1=%b er=%b cs2=%b ds=%b." 56A tape error occurred 57at block 58.Pp 59.It bn. 60Any error is 61fatal on non-raw tape; when possible the driver will have retried 62the operation which failed several times before reporting the error. 63.Pp 64.It tj%d: lost interrupt. 65A tape operation did not complete 66within a reasonable time, most likely because the tape was taken 67off-line during rewind or lost vacuum. The controller should, but does not, 68give an interrupt in these cases. The device will be made available 69again after this message, but any current open reference to the device 70will return an error as the operation in progress aborts. 71.El 72.Sh SEE ALSO 73.Xr mt 1 , 74.Xr mtio 4 75.Sh HISTORY 76The 77.Nm 78driver appeared in 79.Bx 4.2 . 80.Sh BUGS 81May hang if a physical error (non-data) occurs. 82