1HT(4) Kernel Interfaces Manual HT(4)
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6 ht - TM-03/TE-16,TU-45,TU-77 MASSBUS magtape interface
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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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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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31 /dev/MAKEDEV script to create special files
32 /dev/MAKEDEV.local script to localize special files
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35 mt(1), tar(1), tp(1), mtio(4), tm(4), ts(4), dtab(5), autoconfig(8)
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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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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)