- RPN Calculators - http://www.dsv.nl/~ovide/rpn.htm
Calculators in Reverse Polish Notation, but with different approaches, different functions, different methods.
- User Friendly the Comic Strip - http://www.userfriendly.org/cartoons/archives/99aug/19990826.html
about RPN. A good way of explaining RPN with three picture frames. (Note: Erwin is an AI entity that frequently has been moved to different computers and his previous home was a Sun Workstation.)
- Eric Smith's HP Calculator Info - http://www.brouhaha.com/~eric/hpcalc/
Technically page about older HP calculators with simulators for HP-41 and 45 calculators. With links to other calculator-related pages, journal articles, and US patents.
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