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

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)…

Sharp EL-5100

Sharp EL-5100

Sharp PC-1211

Sharp PC-1211


8 Comments (+add yours?)

  1. Mitiay
    Jan 12, 2012 @ 16:05:29


    Do you know the meaning of “CAP” mode on the Sharp PC-1201 (top position of the top switch)? I don’t have the manual and failed trying to figure out.



  2. Jerry O'
    Jan 29, 2012 @ 08:26:17

    Oddly, my Ph.D. is in Psychology, but I’ve always been fascinated by HP calculators. My first one was an HP 25. I was awestruck by the possibilities
    in that little machine. My first project was to get it to do a one way analysis of variance.

    Then I went through a series of HP’s. They were not cheap. I went 50 miles to get an HP 67, and by the use of the little card reader, had it doing eigenvalues, and other stuff.

    The later HP’s annoyed me because of the almost unreadable blue screen.

    I was a prof, and the school was really pushing TI calculators, so I had
    to switch over to those things. They got the job done, but didn’t have the fit and finish of the early TI’s. When they came out, the HP 49+ turned me off

    If you wonder why a psych major was fooling with calculators, it’s simply that
    my Grad School wanted you to be scientific, and I liked Math.

    Pleasant page : Jerry O’Dell, Ann Arbor Michigan


  3. Jerry O'Dell
    Jan 29, 2012 @ 08:28:48

    Hi. I have a Ph.D in psychology, but have been fascinated by calculators.
    My first real calculator was an HP 25; had it doing 1 way analysis of variance in no time.

    Then I went through a series of models. The HP 67 was the most expensive, and the most fun. Had it doing eigenvalues, with the little card reader

    Pleasant page to read:


  4. Jimmy St-Germain
    Mar 03, 2012 @ 20:25:07

    Thanks for the comment!


  5. Antonio
    Jun 26, 2012 @ 09:33:07

    I have the Hp9100B from 1969 and only in recent years has stopped to work, i think its error of video display.


  6. Jean-Marc
    Jul 19, 2016 @ 17:59:48

    My recently acquired PC-1201 will be there later today and I’m searching for a scan of the manual.
    My first programmable calculator was a TI-57 in 1978, so the 1201 keyboard layout seems very familiar to me. I’m sure I can hack my way in but I’m pretty sure the manual deserves a look too.


  7. Marcin
    Sep 17, 2016 @ 11:44:53

    Hi i have sharp pc-1211 for sell for small amount +delivery. if you are still interested contat me


  8. Dayle forrester
    Jan 28, 2017 @ 09:50:57

    Hey bud. Iv got a 75c hp that I was getting rid of, let me know if you or anyone would like it, thanks mate you have a great day,


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