Very interesting article. My dad, an engineer, had the successor to this model, the HP-45. It was an amazing machine for it's time. Because of it, I fell in lov

Very interesting article. My dad, an engineer, had the successor to this model, the HP-45. It was an amazing machine for it's time. Because of it, I fell in love with RPN and refused to use anything else. When I went to college I got an HP-48sx. I think it was the zenith of scientific calculators with so much functionality crammed into it.