ht man page on 4.4BSD

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HT(4)		       BSD/vax Kernel Interfaces Manual			 HT(4)

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

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

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

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

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

4th Berkeley Distribution	 June 5, 1993	     4th Berkeley Distribution
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