RS-232 primer (WilsonMinesCo.com)http://wilsonminesco.com/RS-232/RS-232primer.html
(formerly B&B Electronics) and Assmann: Here are a couple of testers, first Jameco 's 26729 , then B&B Electronics' (now Advantech 's) 9PMTT :
RTTY Teletypehttp://radioblvd.com/rtty_teletype.htm
a company called RTTY Electronics in the California SF Bay Area back on May 14, 1974 - over 45 years ago. RTTY Electronics is still in business in El Sobrante, CA and its owner, P
That's everything I could find.
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