[GreenKeys] TTY Mod 33 adjustment progress

Tue Sep 27 23:38:56 EDT 2016

Doug! I am totally amazed at the lengths you go though to make your 33  
work!

Kudos!

Ed Sharpe Archivist  for SMECC 

In a message dated 9/27/2016 2:24:09 P.M. US Mountain Standard Time,  
douglas-w-jones at uiowa.edu writes:

We've  made progress on the Model 33 we're fixing here at the U of Iowa:

We  had a problem with only being able to print odd-letters, giving:
You  type:  ABCDEFG 0123456789
It prints: ACCEEGG 1133557799

I found  that the rear rail of the carriage was out of adjustment.  
Adjusting this  was "lots of fun".  I actually had to buy a new foot-long 
screwdriver to  reach the right-side mounting screw, and then grind it a bit narrower 
to fit  the screw.

Then, to the cause of the even-odd problem.  The  carriage stop plate and 
guide plate reset were both out of adjustment, causing  stop-slide number 1 
to hang up in the up position.  After adjusting  these, the print trip lever 
release needed, but then there was a huge  improvement as seen in the second 
photo here:
--  http://homepage.cs.uiowa.edu/~jones/pdp8/UI-8/log.shtml#2016-09-27

This  is a big step:  You can now type readable but garbled text!  The  
first-letter spacing problem is obvious (but each time we remove the platten  
to get at other adjustments, we'll have to re-adjust the dash pot, so this  
will be put off for last).  More important, on random keypresses, it  
stutters, so you type just O and it gives OOO, and every once in a while, it  seems 
to randomly substitute letters, for example, N for F, or back-arrow for  W, 
or up arrow for T.

My guess is that the stuttering has to do with  fine adjustments needed on 
the distributer clutch, but it could be something  hanging up in the 
keyboard.  Some time ago, we found a bit of trouble  with the repeat latch there  
(the repeat key does work).  We'll  attack that next.

Doug Jones
jones at cs.uiowa.edu
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