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HT(4) Device Drivers Manual (vax) HT(4)

ht — TM-03/ TE-16, TU-45, TU-77 MASSBUS magtape device interface:

master ht0 at mba? drive ?
tape tu0 at ht0 slave 0

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.

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 ; 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.

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

An ht driver appeared in Version 6 AT&T UNIX.

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

BSD 4 June 5, 1993 HT(4)