Unknown TTY ICs

[Brent Hilpert]

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:
> 
>> 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.
>> 
> 
> 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.