BSD 2.11 - man page for ht (bsd section 4)

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HT(4)											    HT(4)

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

	    NHT  ht_drives # TE16, TU45, TU77

	    #Name Unit# Addr   Vector Br Handler(s)	 # Comments
	    ht	  ?	172440 224    5  htintr 	 # tu 16 massbus tape

       major device number(s):
	    raw: 6
	    block: 0
       minor device encoding:
	    bits 0003 specify HT drive
	    bit  0004 specifies no-rewind operation
	    bit  0010 specifies 1600BPI recording density instead of 800BPI

       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.

       /dev/MAKEDEV	   script to create special files
       /dev/MAKEDEV.local  script to localize special files

       mt(1), tar(1), tp(1), mtio(4), tm(4), ts(4), dtab(5), autoconfig(8)

       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

       tu%d:  not online.  An attempt was made to access the tape while it was offline; this mes-
       sage 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  dif-
       ferent  density than is already recorded on the tape.  This message is written on the ter-
       minal of the user who tried to switch the density.

       tu%d: hard error bn%d er=%b ds=%b.   A tape error occurred at block bn; the ht error  reg-
       ister  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  opera-
       tion which failed several times before reporting the error.

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

       The system should remember which controlling terminal has the tape drive  open  and  write
       error messages to that terminal rather than on the console.

3rd Berkeley Distribution		 January 28, 1988				    HT(4)
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