[GreenKeys] computers and teletypes

[Harold Hallikainen]

On Thu, September 2, 2021 10:21 pm, Keith Lueck wrote:
> Short documentary on how IBM automated message distribution over
> teletypes.  M15, M19 and closeup of what looks like an M28, in addition
> to vintage computer gear...  Also, I think a Frieden of some description
> - I know they used them as operating consoles for some machines of that
> era.  
> Rare IBM Film: "The Big Switch" 1963, and 1410 Data Processing System,
> Computer Network Automation
>

Fun to watch! Note that they convert the incoming 5 level code to a
"binary coded decimal" code used by the computer. This, of course, is
EBCDIC ( https://en.wikipedia.org/wiki/EBCDIC ), which I have not thought
about in a long time!

The video of the torn tape room was fun! They did not really explain the
routing of messages. Their route map seemed to imply there was a single
circuit covering several cities. Were all cities monitoring this line and
only printing what was addressed to them? Was there any switching at the
intermediate cities, or did everything go through HQ?

Fun stuff! Now back to working on my Webcor wire recorder...

Harold
https://w6iwi.org

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