tm —
TM-11/TE-10 mag tape device interface
controller tm0 at uba? csr 0172520 vector tmintr
  tape te0 at tm0 drive 0
NOTE: This driver has not been ported from 4.4BSD yet.
The TM-11/TE-10 combination provides a standard tape drive
    interface as described in
    vax/mtio(4). Hardware
    implementing this on the VAX is typified by the Emulex TC-11 controller
    operating with a Kennedy model 9300 tape transport, providing 800 and 1600
    BPI operation at 125 IPS.
  - 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 terminal 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.
Atm driver appeared in
  Version 6 AT&T UNIX.
May hang if a physical (non-data) error occurs.