TK50 cleaning and unloading issues, new thought:
cz at alembic.crystel.com
Sat May 23 11:16:52 CDT 2020
With the 11/83 running pretty well I decided it was time to derack it
and try putting in a TK50 tape drive. I have two and a TQK70 controller
(which should work with a TK50) so I popped it in and started to test.
On the first unit the tape was already loaded and "stuck". Cleaned the
head by lifting it up, cleaning with isopropyl alcohol on clean no-lint
swabs and it unloaded properly. Now loads and unloads with no issues on
Second unit was a bit more interesting, even with a clean head it would
not unload. It would spin the tape, get to the point where the leader
was on the way through the head system then it would blink endlessly.
Took it out and moved the tape with a screwdriver through the hole and
found the problem:
The leader tongue had bent backwards a bit and as a result it was
getting caught in the head slot when rewinding. The TK50 controller must
be smart enough to detect the increased torque and stopped before
ripping the tongue through. I took it off, bent it back to straight, put
it in and now the tape loads and unloads properly.
I wonder if later model LTO tape units have the same tongue and leader
and can be swapped into a TK50.
Another question: Under RT11 what device is a TK50? Is it MQ or
something else? And is there a utility to allow a TK50 to be written
from a SIMh image to real tape like PDP11GUI?
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