Interesting article on PDA's/HP calcs Message #1 Posted by Jim Creybohm on 16 May 2005, 5:26 p.m.
An interesting read. Even mentions several notables in the HP calculator world (including people). I am unsure of the actual history, but trust this to be as detailed and accurate as anything else I have seen.
http://www.snarc.net/pda/pda-treatise.htm
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