RPL

RPL ("Reverse Polish LISP") is the programming language from HP 28/48 calculators, a mix of Forth and Lisp. Despite their lack of horsepower, these calculators are much more usable and friendly than my Unix workstation.

hpcalc.org - HP48 Software Archive.
HP48 Programming Documentation Files.
cRPL on SourceForge.

This page is linked from: OJOS RPL/2