[GreenKeys] computers and teletypes

[Bruce Gentry]

On 9/2/21 21:07, Bruce Gentry wrote:
>
> I have had and restored wire recorders over the years. I now have a 
> couple German "Minifon" pocket wire recorders that I am going to 
> restore. As far as recording RTTY, the speed variations of the wire 
> could likely be too severe, even at 60 WPM and 850 cycle shift. Almost 
> all wire recorders used "rim drive" to pull the wire along, only a 
> very few had capstan drive. Despite all of this, they could record 
> speech quite well and lively music and singing acceptably. A classic 
> tape recorder with a synchronous motor and capstan drive should be fine.
>
>    Bruce Gentry, KA2IVY
>
> On 9/2/21 20:14, steve bennett via GreenKeys wrote:
>> "Fun stuff! Now back to working on my Webcor wire recorder..."
>>
>> Dude!!!! I have about 5 of those wire recorders!!!
>> First one was gifted to me by my father-in-law then after that every 
>> time I found one in
>> an antique store I bought it.
>> His was working the first time I saw it.
>> None of mine currently work.
>> Too many projects and too little time.
>> Wouldn't it be great to use a wire recorder to send RTTY to a teletype?
>>
>> -Steve AD8CI
>>
>>
>>
>> On Thursday, September 2, 2021, 07:10:08 PM EDT, Harold Hallikainen 
>> <harold at w6iwi.org> 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 
>> <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 <https://w6iwi.org>
>>
>> -- 
>> FCC Rules Updated Daily at http://www.hallikainen.com 
>> <http://www.hallikainen.com>
>> Not sent from an iPhone.
>>
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