[GreenKeys] Re: Fw: Teletypewriters, part 2

[jhaynes@alumni.uark.edu]

I'm not sure why this is going to a select list rather than on greenkeys,
but I'm glad to be getting it.  As some of you may know my "area of 
research" is electromechanical switching systems.  Some of what is coming
across is new material to me.

For the 81D1 and earlier systems the station selector was the SOTUS -
sequentially operated teletypewriter universal selector.  This was a 
machine that could detect individual characters or sequences of characters
and close a contact.  

For later systems I assume the Model 28 stunt box was used, since it had
all the capabilities of the SOTUS built into the printer. There
was a Model 28 replacement for the SOTUS, called the Model 28 sequential
selector.  It was basically a typing unit with the front plate mechanism
removed.

I heard some customers objected to using the Model 28/35 stuntbox for
station selection.  They didn't like the printer sitting there making
noise but not printing anything.  This didn't seem to bother the F.A.A.,
who were one of the first big customers for Model 28 selective calling.



-- 

jhaynes at alumni dot uark dot edu