> Well, I have an Archive Python (4mm) tape drive to which an "mt st" responds
> "mt: st: unknown drive type 7" and I get no registers.  I seem to remember
> things in the st driver being incomplete.

This is something missing from the MI scsi code.. NetBSD does this for
all scsi tapes i've seen. They still work fine for reads and writes,
though.

> The other thing that tips me off is that any attempts to access the drive
> results in esp(0,4,0):  SBUS reset

This, however, looks like a more serious problem :)