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That picture of a cordwood assembled module - tube included -

took me back to 1965 memories.

It's been YEARS since I assembled cordwood modules for

a Boeing prototype??Data Storage And Processor (DSAP)

system for the USAF complete with a magnetic core memory.

As an aside, I had all of the Tech's (I was one of them) save?

the diode lead clippings because they had a high Silver content.

Someone eventually ended up with 10's-of-pounds of silver!

73? Dick/w7wkr at CN98pi

On Fri, Jul 14, 2023 at 11:03?AM John Z <jdzbrozek@...> wrote:

Jim Campbell,

The attached image was scraped from the Hackaday web site. It is an
IBM flip-flop module using a dual triode vacuum tube. You probably saw
these in abundance in your sleep! I first encountered things like this
being sold at a surplus sales house called N. Silverstein's in
Detroit. As transistors and IC's obsoleted tons of old hardware, stuff
like this became available for parts, and for cheap. It helped to fuel
my early teen hobby days in the 1960's.

I went on to work at IBM in Lexington KY and designed chips for use in
electronic typewriter products. Many of our staff came from Endicott.
Later I found myself running the R&D operations for the Inkjet Printer
Division for IBM and later Lexmark.

Regards, JZ KJ4A

On Fri, Jul 14, 2023 at 1:27?PM Jim Campbell <jecspasc@...> wrote:
>
> The Army (ASA) sent me to IBM CE School after which I maintained an IBM
> punch card installation in Germany for two years. After leaving the Army
> IBM hired me at their plant in Endicott, NY in 1960. My first job was as
> a final inspector for IBM 650s. It had hundreds of vacuum tubes and
> thousands of diodes. The storage device was a magnetic drum rotating at
> 12,500 rpm if I remember correctly.
>
> Over the next 34 years I worked with a variety of machines and projects
> ending up in Research Triangle Park, NC as one of the Architects in the
> System Network Architect (SNA) group. I was responsible for the
> maintenance of the architecture of Path Control.
>
>
>
>
>