Stefan's Historical Computing Devices
Slide Rules, Early Calculators, and Old Computers
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       Sun Hemmi 259D,<br>HP-34C, Keuffel & Esser 4181-1, HP-41CX
    Sun Hemmi 259D,
    HP-34C, Keuffel & Esser 4181-1, HP-41CX
    Welcome!

    I have a weakness for old technology. It's not that I don't understand the new technology (I'm a software architect for a leading developer of high-end mathematical software) but there's something I find charming and elegant about the devices used in simpler times.

    Just before the turn of the century, my trusty HP-42S calculator began having troubles so I set out to find a replacement. I was surprised to find that HP no longer made an equivalent RPN calculator. A colleague responded to my plight by giving me his retired HP-19C and HP-41CX calculators, both of which were in need of minor repairs.

    Shortly thereafter, I discovered that there was a healthy trade in used HP calculators dating back to their earliest models from 1972, and I casually started collecting them. After a while, I got interested in slide rules as well, and have built up a small collection of those.

    On this site (one of several I maintain), I plan to showcase my collection and post articles of use or interest to fellow collectors and users of slide rules and calculators.

    Articles

    My Collection

    My collection of slide rules and calculators is small by most standards, but I actually try to use them all, so there isn't much of a point having too many of them. As I write a page for each slide rule and calculator below, its entry in the list will become a link. If one that you're interested in isn't a link yet, please check back soon.

    Slide Rules:

         		    

    Calculators and Computers:
    • Hewlett-Packard 19C NEW
    • Hewlett-Packard 32E
    • Hewlett-Packard 34C
    • Hewlett-Packard 41CX
    • Hewlett-Packard 42S
    • Hewlett-Packard 67
    • Sharp PC-1211 Pocket Computer

    Not Quite Historical Yet:

    As well as these vintage calculators, I own an HP 35s, made by Hewlett-Packard to mark the 35th anniversary of the first scientific calculator. Here is my review of the HP 35s, and two programs I've written: Matrix Multi-Tool and Curve Fitting.

    How to Subscribe to this Site

    You can be notified of updates to this site by subscribing to Stefan's Historical Computing Devices News Feed. Most browsers will subscribe you automatically if you click on this link. If you are using an older browser, right-click the link, select "Copy Shortcut" or "Copy Link", and then paste the address into your reader's add-subscription window. Or, if you use one of the popular on-line readers, click the appropriate icon under the Subscribe heading in the left margin of this page.

    Visit My Other Sites

    Collecting slide rules and calculators isn't my only hobby. I'm also interested in electric powered model airplanes, full-scale aviation, building my own full-scale plane, and electronics, all of which I maintain web sites about:


     
     
    Last updated Thursday April 24, 2008. E-mail Stefan
     

    Disclaimer: Although every effort has been made to ensure accuracy and reliability, the information on this web page is presented without warranty of any kind, and Stefan Vorkoetter assumes no liability for direct or consequential damages caused by its use. It is up to you, the reader, to determine the suitability of, and assume responsibility for, the use of this information.

    Copyright: All materials on this web site, including the text, images, and HTML mark-up, are Copyright © 2008 by Stefan Vorkoetter unless otherwise noted. All rights reserved. Unauthorized duplication prohibited. You may link to this site or pages within it, but you may not link directly to images on this site, and you may not copy any material from this site to another web site or other publication without express written permission. You may make copies for your own personal use.

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