1 Feb
2015
1 Feb
'15
9:06 p.m.
On 2015-Feb-01, at 8:27 PM, Kyle Owen wrote:
On Sun, Feb 1, 2015 at 2:22 PM, Chris Elmquist
<chrise at pobox.com> wrote:
Looking through the repair manual on bitsavers didn't really offer any
obvious hints at the IC numbering scheme. I also didn't see any pictures
online of the internals of one, though I think I know someone who has one.
I could verify that these are in fact Model 43 parts in a few weeks,
perhaps.
I checked a Teletype Model 43. The major ICs are :
TTY
25427
430671 (40-pin, main PCB)
TTY
24988
430641 (40-pin, main PCB)
TTY
25228
342238 (28-pin, keyboard PCB)
TTY
28415
342280 (28-pin, keyboard PCB)
TTY
28430
342280 (28-pin, keyboard PCB, 2 units)
Don't seem to match those in your photos.
The unit checked has date stamps from 1982 on other components.
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
of T3.
TTY custom ICs went into the model 43, the model 40, and certainly other
products that came after my time there.
Very cool! I've got some capability to open these up and take die shots if
folks are interested. Of course, if someone needs these instead, let me
know.
On Sunday (02/01/2015 at 07:00AM +0000), tony duell wrote:
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.