Lisp and Polish notation [was RE: Calculators Re: Useless thread...]

As befits this conversation of RPN, Lisp, and calculators, I thought I'd mention that at one point a couple of years back I hacked together a Lisp "compiler" (really a translator) for the HP-48 series. It's just a small set of RPL programs that translate Lisp code (written using curly-braces in the place of parens, since that's what the HP-48 uses to denote lists) into its RPL equivalent. The similarities between the two languages is so slight (RPL does stand for "Reverse Polish Lisp" after all) it only took an afternoon of doodling around to get a decent subset of Lisp working. Really, it made me appreciate how flexible the HP-48 is -- RPL programs can generate other RPL programs! As a very simple example, {defun foo {a b} {+ a b}} becomes a program named "foo" containing: << -> a b << a b + >> >> Never found a good use for it, but it was a fun exercise :). (If anyone wants the code, I can send it your way...)