Very impressive! I still have the HP-35 I got in 1972. I use an HP-15C as my daily calculator. I remember (and still have, I think) the manual for the HP-35. One of the examples was calculating pi as 113 divided by 355 (355/113). Pretty good approximation. The speed of these calculators is pretty slow compared to today's computers, but they run faster than I can key stuff in and look at the results. Harold --=20 FCC Rules Updated Daily at http://www.hallikainen.com Not sent from an iPhone. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .