[Simh] VAX 8200

[khandy21yo]

It's also fun if they install a tape into the tk50 drive with the info pamphlet that they always shipped with them. It couldn't retract the tape, and you couldn't pull the paper out because of the tight fit. Time to disassemble the drive, again.


Sent from my Galaxy Tab® A
-------- Original message --------From: Ethan Dicks <ethan.dicks at gmail.com> Date: 3/17/17  1:21 PM  (GMT-07:00) To: simh at trailing-edge.com Subject: Re: [Simh] VAX 8200 
On Fri, Mar 17, 2017 at 2:35 PM, Gary Lee Phillips <tivo.overo at gmail.com> wrote:
> Looking at what images I can find on the web, TU-80 seems correct. The one
> we had was just generally flaky, I guess. It was 1600 bpi, 2400 foot tapes,
> yes.

2400' tapes (1.5mil thickness) were standard but sometime later,
thinner (1.0 mil?) 3600' tapes came out.  I have read tape drive
instructions that say not to use those tapes in this machine.  I
wouldn't be surprised if most DEC tape drives didn't like thinner
tape.

> The MicroVAX we added later came with a TK-50 that never had any problems.

That was not a universal experience.  We had a couple of TK-50 drives
and we found them semi-reliable.  They mostly worked, but we had
occasional spectacular problems.  I had to dismantle the drive more
than once to manually rewind a tape back into the tape case.  We also
lost a few of the pickup barbs.  I have a fresh NOS one - I need to
CAD it up and experiment with various plastic films to see about
lasering some replacements.  Once the tip bends, it needs to be
replaced or it will fail at some random but inconvenient time.

-ethan
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