NAME

mt − TM78/TU-78 MASSBUS magtape interface

SYNOPSIS

master mt0 at mba? drive ? 
tape mu0 at mt0 slave 0

DESCRIPTION

The tm78/tu-78 combination provides a standard tape drive interface as described in smtio(7). Only 1600 and 6250 bpi are supported; the TU-78 runs at 125 ips and autoloads tapes.

SEE ALSO

mt(7), tar(1), tp(1)

DIAGNOSTICS

mu%d: no write ring.  An attempt was made to write on the tape drive when no write ring was present; this message is written on the terminal of the user who tried to access the tape. 

mu%d: not online.  An attempt was made to access the tape while it was offline; this message is written on the terminal of the user who tried to access the tape. 

mu%d: can’t switch density in mid-tape.  An attempt was made to write on a tape at a different density than is already recorded on the tape.  This message is written on the terminal of the user who tried to switch the density. 

mu%d: hard error bn%d mbsr=%b er=%x ds=%b.   A tape error occurred at block bn; the mt error register and drive status register are printed in octal with the bits symbolically decoded.  Any error is fatal on non-raw tape.  When possible the driver will retry the operation which failed several times before reporting the error. 

mu%d: blank tape.  An attempt was made to read a blank tape (a tape without even end-of-file marks). 

mu%d: offline.  During an I/O operation the device was set offline.  If a non-raw tape was used in the access it is closed. 

BUGS

If any non-data error is encountered on non-raw tape, it refuses to do anything more until closed. 

Version 2.3  —  July 04, 1985