Most Treasured HP Collectible

[Bill Duncan]

This is a hard one.

I still have my original HP-41C. One of the early ones with gold contacts and, I think it was a "bug 3" machine IIRC. I made the switch from a TI-58 and never looked back. I've since picked up a CV and CX and many of the peripherals.

But, while nowhere near as capable, I still love the feel of the HP-29C. And, the HP-15C which was amazing. My original HP-15C was stolen, but I picked one up as well as the LE version since.

The HP-16C was so unique. I developed a fast integer square root algorithm using it.

I guess I'd have to say my original HP-41C. Not used as much as the others now however..