Unknown TTY ICs
chrise at pobox.com
Sun Feb 1 14:22:09 CST 2015
I asked the question over on the Greenkeys list where all the Teletype experts
hang out. I got this reply,
Date: Sun, 1 Feb 2015 14:05:00 -0600
From: Paul Kasley <kasley at fnal.gov>
To: chrise at pobox.com, greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] Fwd: Unknown TTY ICs
Teletype did indeed make their own ICs and they did indeed mark them
“TTY”. My first assignment as a co-op in 1973 at the T7 R&D facility
was to profile PN junction depths on diffused wafers. The R&D fab was
on the first floor of T7. Just off the T5 cafeteria was the epitaxial
deposition lab. The PMOS manufacturing facility was on the north side
TTY custom ICs went into the model 43, the model 40, and certainly other
products that came after my time there.
The initial process was P-channel and they did eventually make N-channel
Tag Waggener was a WECO guy that came to TTY in ‘73 to lead the
effort. He chronicled it in “Teletype, We made That Data Move”
(self-published on lulu.com).
-Paul Kasley W9TS
On Sunday (02/01/2015 at 07:00AM +0000), tony duell wrote:
> > Can anyone identify these TTY ICs? A friend gave them to me, but doesn't
> > recall what they came from.
> > http://i.imgur.com/AIfiOyY.jpg
> Possibly out of a Model 43. There are 2 40 pin custom ICs on the main board and some 24 (maybe 28)
> pin ones on the keyboard.
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