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@(#)mt.4 6.3 (Berkeley) 06/01/86

C 4 mt - TM78/TU-78 MASSBUS magtape interface master mt0 at mba? drive ?

tape mu0 at mt0 slave 0

The tm78/tu-78 combination provides a standard tape drive interface as described in mtio (4). Only 1600 and 6250 bpi are supported; the TU-78 runs at 125 ips and autoloads tapes. mt(1), tar(1), tp(1), mtio(4), tm(4), ts(4), ut(4) mu%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.

mu%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.

mu%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.

mu%d: hard error bn%d mbsr=%b er=%x ds=%b. A tape error occurred at block bn; the mt error register 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 operation which failed several times before reporting the error.

mu%d: blank tape. An attempt was made to read a blank tape (a tape without even end-of-file marks).

mu%d: offline. During an i/o operation the device was set offline. If a non-raw tape was used in the access it is closed.

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

Because 800 bpi tapes are not supported, the numbering of minor devices is inconsistent with triple-density tape units. Unit 0 is drive 0, 1600 bpi.