HP Calculator Emulators for the PC - your very own HP-48

HP-48 was a graphing calculator that uses Reverse Polish notation using RPL (Reverse Polish LISP). It's pretty the best calculator. Ever.



http://www.hpcalc.org/hp48/pc/emulators/

The HP calculators are fully programmable, and you can also download a LOT of applications for it. Even games :-).