Yo people!
It's a very good calculator. Works on both Portfolio and PeeCee.
Use expresions like:    2+2
                        sin(pi)
                        sin(pi/2)
                        34/78
and of course other ;-)
For Portfolio users: set the External Screen to Tracked, Refresh to Both
and Speed to Fast. Watch out the batteries!

                                        Greetz,
                                        PiLA/KtS (pila@maloka.waw.pl)
PS.
The calculator is not written by me, of coz!