[GreenKeys] 1964 Teletype Corp R& D directory

[Harold Hallikainen]

>
>  In case you were wondering about this guy, a frequent greenkeys
> contributorhttps://ethw.org/First-Hand:Chad_is_Our_Most_Important_Product:_An_Engineer%27s_Memory_of_Teletype_Corporation
>

Fascinating read! Spent the whole morning on it. Some of it reminds me of
my experiences in the early 1970s. There was mention of the Alden fax
machines. I maintained one of those for an FAA flight service station. It
was an interesting soggy paper machine that printed weather maps. The FSS
also had a LOT of Teletype equipment!

There were several mentions of the first UART chip. I used the General
Instruments AY-5-1013 in an early product. Before that, I had used a bunch
of 8 bit parallel in, serial out shift registers in series to send the
time of day to a model 15 printer. A diode matrix converted parallel BCD
from a digital clock (with Nixies) to Baudot to drive the shift registers.
With 8 bits per character, I sent a start bit, 5 data bits, and two stop
bits for each character.

On modems, I built my first Bell 103 modem using wire wrap and the XR2206
and XR2211. I used it with a Lear Siegler ADM-1A terminal to connect to
Telenet to connect to The Source, a consumer time share service. On the
Source, I used a cross assembler for the Motorola 6800. Would then
download the hex code into a Sunrise Electronics EPROM programmer and plug
the EPROM into my wire wrapped MC6802 computer.

The Bell 103 modem design was also used in a telemetry system I designed
(TEL-171 at
https://bh.hallikainen.org/wiki/index.php/HallikainenAndFriends ). I later
did a Bell 202 half duplex modem with the XR2206 and XR2211 for the
DRC-190 (also on that web page).

Again, fascinating reading! Thanks for posting!

Harold
https://w6iwi.org



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