1HT(4)                      Kernel Interfaces Manual                      HT(4)
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NAME

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

9       /sys/conf/SYSTEM:
10            NHT  ht_drives # TE16, TU45, TU77
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12       /etc/dtab:
13            #Name Unit# Addr   Vector Br Handler(s)      # Comments
14            ht    ?     172440 224    5  htintr          # tu 16 massbus tape
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16       major device number(s):
17            raw: 6
18            block: 0
19       minor device encoding:
20            bits 0003 specify HT drive
21            bit  0004 specifies no-rewind operation
22            bit  0010 specifies 1600BPI recording density instead of 800BPI
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DESCRIPTION

25       The  tm-03/transport  combination provides a standard tape drive inter‐
26       face as described in mtio(4).  All drives provide  both  800  and  1600
27       bpi;  the  TE-16  runs  at 45 ips, the TU-45 at 75 ips, while the TU-77
28       runs at 125 ips and autoloads tapes.
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FILES

31       /dev/MAKEDEV        script to create special files
32       /dev/MAKEDEV.local  script to localize special files
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SEE ALSO

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

38       tu%d: no write ring.  An attempt was made to write on  the  tape  drive
39       when no write ring was present; this message is written on the terminal
40       of the user who tried to access the tape.
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42       tu%d: not online.  An attempt was made to access the tape while it  was
43       offline;  this message is written on the terminal of the user who tried
44       to access the tape.
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46       tu%d: can't change density in mid-tape.  An attempt was made  to  write
47       on  a tape at a different density than is already recorded on the tape.
48       This message is written on the terminal of the user who tried to switch
49       the density.
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51       tu%d: hard error bn%d er=%b ds=%b.   A tape error occurred at block bn;
52       the ht error register and drive status register are  printed  in  octal
53       with  the  bits  symbolically  decoded.   Any error is fatal on non-raw
54       tape; when possible the driver will have retried  the  operation  which
55       failed several times before reporting the error.
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BUGS

58       If  any non-data error is encountered on non-raw tape, it refuses to do
59       anything more until closed.
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61       The system should remember which  controlling  terminal  has  the  tape
62       drive open and write error messages to that terminal rather than on the
63       console.
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673rd Berkeley Distribution      January 28, 1988                          HT(4)
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