Persistent Technology

Here's a quick picture of my HP calculator Classic series collection. OK, the HP-67 (bottom left) is technically not from the Classi...

Interesting Accuracy Feature of the HP-35 (Reproduced from November 1976 issue of HP Journal. Thanks Eric Smith for reference to this ...

My HP Classic Family Grows! My 1973 production HP-80 (left) now has an older brother, a 1972 production HP-35, received today from a ...

The World’s First Businessman’s Pocket Calculator   Introduction Hewlett-Packard redefined portable computing with...