[GreenKeys] 20ma current loop for my Dad's KSR 33

Jeff Albrecht jeffa at rodaw.com
Mon Oct 7 18:47:08 EDT 2019


This was my Dad's. Wayne says it is a TWX machine. Dad had it hooked up 
to an IMSAI ~ forty years ago, although all the details of his 
connections that apparently were made in one of the two connectors that 
look like they would be hooked up to a phone system have been lost. I'm 
pretty sure it was via a IMSAI SIO. I personally played Star Trek on it.

I'd like to connect Dad's KSR like I did with this ASR 33 I bought 
several years ago and hooked it up as shown on my wiki page;
https://wiki.theretrowagon.com/wiki/20ma_current_loop_to_RS-232_conversion#Image_details 
Theoretically should that wiring configuration work on Dad's KSR? The 
numbered screw strip in the second image?

So I went to plug it into A/C to see how it did in Local mode. 2 of the 
3 fuses (see last image) are labeled. The third that is missing it's 
fuse is not labeled. Any idea what fuse value I should place in there?



Inside the KSR show above.





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