[GreenKeys] TD operation on 28ASR

[w9ddd at tapr.org]

Well there's this training doc:
http://www.navy-radio.com/manuals/tty/28asr-kt-switching.pdf

Then there are two different cams.  Not sure if that is related to whether you have a perforator or a re-perforator.  For example with just a perforator it can only punch tape from the mechanical linkage to the keyboard.  With a re-perf you can punch the keyboard via the mechanical linkage or from an electrical signal which might be the keyboard.  This probably implies different wiring on the switch as well.

I'm sure someone can make this all clearer.  I'll bet somewhere along the line someone has made nice chart.

John, W9DDD


> On Feb 9, 2020, at 8:05 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:
> 
> I think all you are missing is that the K-KT-T switch is based on how
> the machinery works rather than on how the operator of the machine
> understands it.  K-KT-T was confusing to the operators, since
> it really applies only to the keyboard and punch and not to the set
> as a whole.
> 
> Then we have the fact of the U.S. Model 19-28-35 ASR set architecture
> where the punch has its own selector and the tape reader has its own
> signal generator.  Versus the European and Model 33 ASR architecture
> where the punch is driven mechanically by the printer, and there is
> only one signal generator (distributor) for the keyboard and tape reader.
> 
> In either case if you have the tape reader and the keyboard in the
> same circuit and you try to send from tape and hit keys on the keyboard
> you are going to get hash.
> 
> I don't enough about 28 ASR sets to know if the connection you describe
> was widely used or if it applies only to some of the sets and others
> did allow tape reading in the K position.
> 
>    ---
> 
>    "Ya can argue all ya wanna, but it's dif'rent than it was."
>    "No it ain't! No it ain't!  But ya gotta know the territory."
>        Meredith Willson, The Music Man
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