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 mtio(4). Only 1600 and 6250 bpi are supported; the TU-78 runs at 125 ips and autoloads tapes.

SEE ALSO

mt(1), tar(1), tp(1), mtio(4), tm(4), ts(4), ut(4)

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 change 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 have retried 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. 

Because 800 bpi tapes are not supported, the numbering of minor devices is inconsistent with triple-density tape units.  Unit 0 is drive 0, 1600 bpi. 

4th Berkeley Distribution  —  June 1, 1986