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Curta...

Ray Traced Curta
Disassembling a Type 1
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HPs Needed
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Inside a HP-11
About a HP-95
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Texas Instruments...

TIs Needed
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THE CALCULATOR REFERENCE

Last Update: Feb 04, 2007


CURTA Logo Hewlett Packard Logo Texas Instruments Logo


Welcome to The Calculator Reference

Here you will find a wealth of data I have collected over the years on HPs, on TIs and on my all time favorite mechanical calculator, the CURTA.

My favorite calculators are HPs but I don't plan on this page even starting to compete with "The Museum"! Look around, enjoy yourself, and marvel over how these little silicon devices changed the world.

-Rick Furr-



NOW THREE CALCULATOR POSTERS ARE FOR SALE!!!

Curta Poster
Click Here
HP Poster
Click Here
Curta Poster in German
Click Here
The Calculator Reference is proud to now offer THREE fabulous calculator posters. The wildly popular Curta Calculator poster, the Calculators of HP poster and the new Curta Calculator poster printed in the German words of the Great Master, Curt Herzstark. Click on any picture to learn more.... -Rick-

NEW HP CALCULATORS!

Hewlett Packard Publications Hewlett Packard Publications Hewlett Packard Publications

Learn more about the HP-12C Platinum, HP-32C, and the HP-33CS on the HP Reference page.


HELP!!!
Frequently Asked Questions

Here are places that will help you with your most frequently asked questions concerning repairs, spare parts, and manuals.





Calculator Collectors, Data, Classifieds, Mail Distribution Lists, and Forums

The title says it all, this is a collection of Collector Lists, Data Lists, Classified Lists, Mail Distribution Lists, and Forums. 

If you are wanting to buy or sell a calculator then reference the Classified Lists, Mail Distribution Lists, and Forums section.





Calc 98

Download Calc98 (Free) Over a million PC users have already downloaded Calc98, our popular free engineering, scientific and financial calculator for Windows. The calculator includes functions for statistics, use of different number bases (binary, octal, hexadecimal and base-n), metric units conversions and physical properties and constants. It has financial functions including investment, loan and mortgage calculations. It also calculates time functions and has a stopwatch feature and RPN (Reverse Polish Notation). It runs on Microsoft Windows (WindowsNT, Windows95/98/ME, Windows2000/XP) and WindowsCE (Pocket PC).




Desktop Calculators

Here is some information on some very interesting and some very common desktops that I own.





Keyboard Trivia

Why is the telephone touch-tone key pad arranged differently from the calculator key pad?

Why is the keypad arrangement different for a telephone and a calculator?

Doing the Numbers - Why Calculator and Phone Number Layouts Differ





Electronic Displays

This is my article on Electronic Displays that appeared in the Winter-Spring 1997 International Calculator Collector.





The Calculating Machines Numbers

If you've ever been to Erez Kaplan's -- Calculating Machines page then you will have noticed his cool rolling numbers image. Click this title if you would like to see all of the different numbers used in this cool image. Go to his page if you want to see the real thing.





The Collector's Guide to Pocket Calculators

"This is another must have for ANY calculator collector." - Rick Furr.

"The Collector's Guide to Pocket Calculators" by Guy Ball and Bruce Flamm is back from the printer and now being shipped. This 200+ page, softcover book contains a detailed listing of over 1500 known portable/pocket calculators from the early 1970's (the "Golden Age of Pocket Calculators"), as well as historical information from the 1960's and 1970's.

The book features over 470 photographs of various models from over 220 manufacturers around the world (including calculators from lesser-known companies in England, Switzerland, Netherlands, Spain, Germany, Bulgaria, and Russia).

"The Collector's Guide to Pocket Calculators" also includes a comprehensive value guide to help you gauge rarity and desirability of the various models -- especially as they relate to each other.

The book can be purchased for $23.95 plus $4 for USA first class mailing ($6 to Canada and Mexico, $8 for airmail to other countries). California residents please add $1.86 state sales tax.

Mail to:

Wilson/Barnett Publishing

P.O. Box 345
Tustin, CA 92781-0345
USA

For additional information, contact Guy Ball


Other Links

CURTA

CALCULATORS

Mechanical Info

HP

TI

SLIDE RULES

OTHER

RALLY

For Sale


What's New

Information about what changed at the Calculator Reference

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The Calculator Reference by Rick Furr (rfurr@vcalc.net)