[GreenKeys] Model 28D typing unit question

[Don Robert House]

Jim,

The only special codings I remember other than the normal 7.42 could  
have been for the 28 KSR terminal unit used with the WECo 101 ESS  
machine.
I was told that the typing unit and type box were special.  My job was  
to remove most of the keys from the keyboard and fill them with blanks.
Then add keylevers back into the keyboard only in certain places.   
Even the space bar was used as a character.   When I finished the  
machine looked like
it was put together by a drunk.  The only way you could type on it was  
one key at a time.

Later ESS machines used the Model 35, Model 43, and Model 40.

Don

On 19 Jan 2008, at 5:22 PM, jhhaynes at earthlink.net wrote:

On Sat, 19 Jan 2008, Nick England wrote:

> Anyway - 28D mystery keyboard driving gear looks like163503
>               28A standard keyboard driving gear is 150441 (which  
> matches
> all the manuals I have)

I'm looking at 573-115-800TC Issue 3 May 1969.  It says
150441 is for 7.42 and 11.0 unit code
163503 is for 7.00 unit code, 50/75 Baud
178764 is for 7.00, 7.50 unit code

On the keyboard the driving gear is part of the same piece that has the
clutch.  The normal one i(Mark II) seems to be 151154  There is a  
163519 that is part of a mod kit (320236) to modify keyboard with  
distributor from 7.42 code to 7.00 unit code operating at 8.05 [sic]  
Baud.  Then on another page for Signal Generator Shaft Mechanism Mark  
III it says
154032 for 7.42 unit code, 163519 for 7.00 unit code, and 178787 for
7.50 unit code.

What I can't explain is why any code other than 7.42 would be used on
a Bell System unit.

I didn't really get the picture where you are talking about contacts
on the spacing drum associated with tab stops.  However it was normal
in an ASR or a printer associated with tape sending to have contacts
on the tab mechanism in the printer.  This was to open the circuit to
the feed magnet on the tape reader so as to stop the tape reader long
enough for the tab operation to complete before reading the next
character from tape.  What a kluge!


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