[vcf-midatlantic] Museum report: terminals
hjohnson at retrotechnology.info
Mon Jul 9 11:39:17 EDT 2018
> Regarding the terminals: now that we pretty know * what * we have, the
> next step is to organize it all. Right now it's all in one aisle, but
> only a little organized by cart/shelf. There are some obscure terminals
> that we probably don't need, and not enough of what we probably do need.
> This job will be hard work due to the weight of TTYs and stuff.
Well, Evan asked me to come in on Sunday, to review the terminals and
inventory them. That's because of my experience in the era of the 1970's
and 80's. I was a minicomputer and mainframe site manager, and I was a
technical student user at various universities; later I was a digital
engineer. I also repair terminals. I'll walk though what I saw, and post
a summary here to inform the people Evan is asking for help. I'll send
Evan a more detailed report, but he has the list and location-of
information I compiled Sunday.
I did a quick survey (two hours), focused on CRT-based terminals and
gave the list to Evan. Only warehoused terminals, not ones on display.
Mostly there's DEC terminals. A dozen VR-201's (most with "moldy" CRTs).
VR-201's are CRT "heads" which have a cabled keyboard, and often were
used with DEC desktop computers. Also a few DEC VT-100 or VT-180; the
180's may have a microcomputer. A few DEC 200 or 400 series terminals.
A few each, of ADM-3A, Heath H19 (Zenith Z19), a Perkin-Elmer model, an
IBM model, a few other brand/models. There's a small number of one-each
of ASCII based commodity terminals - this is what Evan called "obscure"
I think. Hazeltine brand, ADDS, and so on. Evan has the list, he can
provide details. Some of these have "moldy CRTs" too.
Many terminals used detatched keyboards. There's boxes of keyboards,
which I did not survey; so I don't know if there's enough or too many!
And there's a few mechanical or printing terminals, which I did not
survey but noted. I didn't cover monitors - I'll explain why that
matters to terminals.
I saw many "moldy" CRT's - that's when the front of the CRT has a
transparent cover that's separating from the glass. Repair means
replacing the CRT, which can take most of an hour depending. CRT's are
available for tens of dollars for common types, some CRTs can be swapped
around from microcomputer monitors, even old TV's. A number of tech
volunteers are familiar with these repairs.
Evan said "There are some obscure terminals that we probably don't
need". I disagree, for several reasons. If they work, they are useful;
if they don't the CRTs may be useful. It's a matter of history - lots of
little companies made terminals, it's not all IBM, DEC, HP. Here's my
experience, Evan - computer rooms in the era used lots of kinds of
terminals. Also: to provide public visitors with a terminal they can
bang on. And, terminals won't be EASIER to get in the future.
But, it's ALSO true, there were computer-rooms with one kind of
terminal. The HP, Perkin Elmer, IBM, DEC terminals I saw may go with
specific minicomputers in the collection. The museum may need more of
those. Only DEC VR201's seem to be in any quantity.
Evan's focus on Sunday, was to identify and organize. I'm looking a
little further ahead, to repair and potential uses. Now, with a list in
hand, Evan can ask others to look over specific terminals for repair, to
identify monitors as "CRT donors", to solicit CRT's for replacement. And
to start looking to match minicomputers with terminals for display and
use. And, to allocate terminals for various purposes, and to tell people
what terminals we have or don't have. I'm describing my general results
here in the list, so people with terminals or monitors, or skills, are
better informed and can offer specific help or items.
Herbert R. Johnson, New Jersey in the USA
http://www.retrotechnology.com OR .net
preserve, recover, restore 1970's computing
email: hjohnson AT retrotechnology DOT com
or try later herbjohnson AT retrotechnology DOT info
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