[GreenKeys] TD operation on 28ASR

[Jim Haynes]

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.

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 	"Ya can argue all ya wanna, but it's dif'rent than it was."
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 		Meredith Willson, The Music Man