HT(4)

NAME
ht - TM-03/ TE-16, TU-45, TU-77 MASSBUS mag tape device interface:

SYNOPSIS
ht0 at mba? drive ?
tu0 at ht0 slave 0

DESCRIPTION
NOTE: This driver has not been ported from 4.4BSD yet.

The TM-03 transport combination provides a standard tape drive interface as described in mtio(4). All drives provide both 800 and 1600 BPI; the TE-16 runs at 45 IPS, the TU-45 at 75 IPS, while the TU-77 runs at 125 IPS and autoloads tapes.

DIAGNOSTICS

tu%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.

tu%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.

tu%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.

tu%d: hard error bn%d mbsr=%b er=%b ds=%b. A tape error occurred at block bn; the ht 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.

SEE ALSO
mt(1), tar(1), mt(4), mtio(4), physio(4), tm(4), ts(4), ut(4)

HISTORY
An ht driver appeared in AT&T UNIX.

BUGS
May hang if physical (non-data) errors occur.