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

TM(4)							     Kernel Interfaces Manual							     TM(4)

tm - TM-11/TE-10 magtape interface
/sys/conf/SYSTEM: # Setting AVIVTM configures the TM driver for the AVIV 800/1600/6250 # controller. For more details, see /sys/pdpuba/tm.c. NTM tm_drives # TM11 AVIVTM YES # AVIV 800/1600/6250 controller /etc/dtab: #Name Unit# Addr Vector Br Handler(s) # Comments tm ? 172520 224 5 tmintr # tm11 driver major device number(s): raw: 7 block: 1 minor device encoding: bits 0003 specify TS drive bit 0004 specifies no-rewind operation bits 0030 specify recording density: 0000: 800BPI 0010: 1600BPI (AVIVTM and some other controllers) 0020: 6250BPI (AVIVTM only)
The tm-11/te-10 combination provides a standard tape drive interface as described in mtio(4). The standard DEC tm-11 operates only at 800 bpi. Other controllers of this type may also allow operation at 1600 bpi, under software control or by switching manually.
/dev/MAKEDEV script to create special files /dev/MAKEDEV.local script to localize special files
mt(1), tar(1), tp(1), mtio(4), ht(4), ts(4), mt(4), dtab(5), autoconfig(8)
te%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 termi- nal of the user who tried to access the tape. te%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. te%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. te%d: hard error bn%d er=%b. A tape error occurred at block bn; the tm error register is 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. te%d: lost interrupt. A tape operation did not complete within a reasonable time, most likely because the tape was taken off-line during rewind or lost vacuum. The controller should, but does not, give an interrupt in these cases. The device will be made available again after this message, but any current open reference to the device will return an error as the operation in progress aborts.
If any non-data error is encountered on non-raw tape, it refuses to do anything more until closed. 3rd Berkeley Distribution January 28, 1988 TM(4)