My own collection
I have a small (albeit growing) collection of HP calculators…
I bought the HP-21 because it was a cute little calculator and it was an inexpensive way to beef up the collection.
HP-25: same reason as above
This HP-97 is a little bit out of the ordinary because it has been modified to act as a controller of some sort. This particular unit was used at the Los Alamos National Laboratory and was sold as government surplus.
I bought my beloved HP-41CV brand new back in 1982. I had been reading about HP calculators for a while and the HP-41 in particular and saved all my money to get one. I also have the Xfunctions, Time and Math I modules.
While being at the University of Sherbrooke, one of my fellow students showed me his brand new HP-28S back in 1988. It was an incredible machine then and even now. Probably my favorite HP calculator.
I found this pristine HP-48SX in a pawn shop for 20 dollars back in 1996.
HP-10bII: inexpensive and pretty
A modest goal of mine is to acquire all HP and non-HP calculator models that flew in space. So now I’m only missing a HP-65 and an Elektronika Mk-52. I would also like to get my hands on a HP-9100B, a HP-71B, a HP-75C, a HP-16C, a HP-42S and a HP-01. I do not intend to have a unit of each model ever released. Just those for which I feel an interest of some kind.
In recent years, HP calculators haven’t projected the appeal that older calculators had but I must admit to a soft spot for the form factor of the HP-20B…
The first programmable calculator I ever had was a Sharp PC-1201 in 1980 and it seems they’re really hard to come by these days. Here we are now, 28 years later, reacquainted (I still have the original manual for the calculator).
Here it is, my very first programmable calculator, the Sharp PC-1201
I’d also like to get a Sharp EL-5100 and a Sharp PC-1211 (which I also owned as a teenager)…