[GreenKeys] computers and teletypes

[Bruce Gentry]

Frieden made a typesetting system called the "Justowriter" that used a 
punched tape. I hve never actually seen one, but they were supposedly 
popular in print shops for small documents.

    Bruce Gentry, KA2IVY

On 9/2/21 19:09, Harold Hallikainen wrote:
>
> 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. Â
>> 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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