[GreenKeys] Wonder if either of these items would be of use for today's RTTY people?

[Ralph Irish]

I don't know exactly when I got these items, but I just ran across them recently. I may have had 
more than one set of them, not certain. These are unused after putting them together. Got lost 
behind something and long forgotten. 
I doubt if "Electronic Systems" is still in business. At least not under that name. I suspect that it 
might have been a 'basement business' operated by a couple of hams. I've not tried that phone. I 
also noted the two different PO Boxes/cities used by them, also two different copyright dates. 
I don't know how much interest in using either RS-232 or TTL levels for operation in today's RTTY 
workplace. Working with a 20 ma Loop is possible with one of them. 
I'm putting them on GreenKeys on the chance that someone might either have a use for them or can 
see a way to modify them for use with present day data levels. 
They could easily be duplicated on PC boards as 'one off' units or someone might be able to make them 
in numbers should they be useful. 
My interest in RTTY has come and gone many times in the past 40-some years. No telling if I ever used 
one of these or not. Certainly not the ones in the attachments. 
I hope this is not wasted bandwidth here. I welcome comments. 
73, 
Ralph - W8ROI 

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