Some Material Related to Historic Hewlett Packard Calculators and Computers

Most of the now classic Hewlett Packard pocket calculators and mini computers were technically advanced devices. In the 1970s and 1980s they were very popular among students, scientists, engineers and technically minded people. While not cheap, they combined excellent technology and high manufacturing quality with robust design.

This and the linked pages contain some bits of information which I have collected and also made available via the larger web sites dealing with HP calculators.

It is not my intention to start another site about HP computers. You can find sites with an exhaustive wealth of information easily on the web by searching for terms like "HP Museum" etc. Some of them also offer CDs and DVDs with collected material which are highly recommended.


German Literature for Hewlett Packard 41/71/80 Computers

Here, you can find a complete collection of the nine books in PDF format published by the Heldermann Verlag in the 1980s.
Note that the books are in German.


Deutsche Literatur für Hewlett Packard 41/71/80 Rechner

Hier finden Sie eine vollständige Sammlung der neun Bücher, die vom Heldermann Verlag in den 1980er Jahren veröffentlicht wurden.
Diese Bücher liegen in deutscher Sprache vor.


Some Write-ups from my Digital Scrapbook

(short PDF documents)

Making Your Own HP-IL Cable

Repairing a broken key on the HP 12C Platinum Calculator

HP Flexible Disk Formats

Using the HxC Floppy Emulator with HP Systems

The GET and LET functions in the Solver on HP Calculators

Plotting Curves at Constant Speed

Repairing a ThinkJet Printer's Ribbon Cable

Repairing a Transtec TT401 RS232 Terminal

Some TrueType fonts mimicking HP-71, 75, 85, 86/87 screen fonts

The HP-IB "SnifTer" Debugging and Display Tool for HP-IB

Some of my own Quick Reference Cards

(written for my own purposes)

print out and fold or laminate.


HP-IB Devices

HP-IL Devices

Building a "Red Eye" receiver

Arduino Source Code

Explains how to build your own receiver to capture the print output of HP pocket calculators.

Reader Software Application for HP-41 Barcodes

Java software to read scanned barcodes and convert them or print program listings.

  Some Bits and Pieces for Sale

On this page I offer some difficult to obtain parts and accessories for HP-calculators and HP-computers. Note that this an offer for fellow enthusiasts and no commercial undertaking.

   Epson HX-20 related Information

After I received and repaired a few Epson HX-20 laptop computers I wrote down my experience with these units.

In addition I wrote a small screen emulator program which allows using a PC to connect to the HX-20 and to use the large screen of the PC for editing programs and outputting graphics.

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