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2025-08-07
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2026-01-25
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HTTP/1.1 200 OKContent-Type: text/htmlContent-Length: 54492Connection: keep-aliveLast-Modified: Sun, 02 Feb 2025 21:19:46 GMTServer: AmazonS3Date: Sun, 25 Jan 2026 09:13:22 GMTETag: 8d1427aad9cbc28fd674af0b36c733d0X-Cache: RefreshHit from cloudfrontVia: 1.1 bd8c16c206acee72e6a2b3f5e3d960cc.cloudfront.net (CloudFront)X-Amz-Cf-Pop: HIO52-P3X-Amz-Cf-Id: Hrim1t6nDrlwETgrO5Yz7_gP5XrxI_5iGcIS_Xx3ht1lmenB1Jg5cg !DOCTYPE html>html langen> head> meta charsetutf-8/> title>THE CALCULATOR REFERENCE/title> meta namedescription contentCalculators, Telephones, Currency, Money> meta namekeywords contentCalculators, Telephones, Currency, Money, HP, Hewlett Packard, Texas Instruments, TI, Curta, Herzstark, Posters, Display, Road Rally, Collector, Collectable, Teacher, Teaching Aid> meta nameauthor contentRick Furr, rfurr(at)vcalc.net> script> var _gaq _gaq || ; _gaq.push(_setAccount, UA-31578975-1); _gaq.push(_trackPageview); (function() { var ga document.createElement(script); ga.type text/javascript; ga.async true; ga.src (https: document.location.protocol ? https://ssl : http://www) + .google-analytics.com/ga.js; var s document.getElementsByTagName(script)0; s.parentNode.insertBefore(ga, s); })(); /script> !-- link relshortcut icon hrefhttp://example.com/favicon.ico />--> link relstylesheet hrefstyles.css> !--Georgia Font--> !-- Override the background style in styles.css --> style> body{ background: url(images2/calcback6-full.jpg); } /style> /head> body> a IDtop>/a> table stylewidth: 100%;> tr> td colspan2> div classdiv-center> br> img SRCimages2/VCalc.net-394x150.png altLogo> br> !-- h1>b>THE CALCULATOR REFERENCE/b>/h1> --> img SRCimages2/TheCalculatorReference.png ALTThe Calculator Reference > p>/p> !--SCRIPT TYPEtext/javascript LANGUAGEJavaScript SRCcgi-bin/counter4.cgi?pageindex&start89652>/SCRIPT>--> !-- DONT CHANGE THIS DATE - ITS WHEN THE COUNTER WAS STARTED --> (since April 22, 1997) !-- DONT CHANGE THIS DATE - ITS WHEN THE COUNTER WAS STARTED --> p>/p> b>Last Update: February 02, 2025/b> /div> !-- last update date Feb 02, 2025 - Added a link to TI 84 Online Calculator Jan 31, 2022 - CU People List Aug 28, 2021 - Expanded table to encapsulate everything to see if cell phones centered better... Aug 26, 2021 - Removed all the in page styles> added Classimg-poster for image border control Aug 14, 2021 - Moved link images from images2/ to images2/Display/ Aug 06, 2021 - Validator - ALL OK except for table tweaks (width, cellspacing, cellpadding, align, valign) - Removed Risk game link - Remove webring.org link (gone!) Jul 07, 2021 - added Curta book to Curta page Mar 25, 2021 - added Angelica Landichos Pigly link - changed Erez Kaplans - Calculating Machines to the Wayback Machine - added Christophe Merys Calculating Machine Documents link - Added Had TO Know link Samuel Pearl administrator@had2know.com Dec 23, 2020 - added Links sent from emails, removed dead ones... Oct 18, 2020 - added html langen> and meta charsetutf-8/> Aug 03, 2020 - Updated Curta Registry and Curta Model Variations Sep 20, 2019 - Page formatting (title above the left menu) - Removed Dead Links Jun 08, 2019 - Added Table of Electronic Components Poster Jun 03, 2019 - Updated Curta page Mar 27, 2019 - More Link Icons - Removed - Office Machine Americana by Ernie Jorgenson - Ernie Passed Away Mar 26, 2019 - Added some Mechanical Calculator links - removed links (dead) - Calculating Machines by Erez Kaplan - ConvertAuto link for Lilly Hammond a NCSU student - International Unit Conversion Calculator by Webmaster - Steve Browns Links by Steve Brown - DAntiques - Calculators, Slide RulesX by Dan Dotson - Mit uns können - Sie rechnen! by Prof. Karl Kleine - Museum of Soviet Calculators by Andrew Davie - Soviet Calculators Collection by Sergei Frolov - Calculators and Their History by Boris Chomski Jan 02, 2018 - Registry Update Nov 20, 2017 - Added Links sent from emails Aug 20, 2015 - Moved Curta links to Curta page Jan 17, 2015 - Updated left menu link and synced with Curta page links Mar 14, 2013 - Morse Code Poster June 3, 2012 - HP Poster 2 May 09, 2012 - Added Google Analytics Feb 27, 2012 - Added ConvertAuto link for Lilly Hammond a NCSU student Feb 18, 2011 - Added lots of pretty links w/logos... Jan 28, 2011 - Added Meta data, longer introduction, web calculator link Oct 01, 2010 - Added The Calculator Reference logo Aug 27, 2010 Aug 03, 2010 - Added Visibone charts Aug 03, 2010 Aug 01, 2010 Jul 28, 2010 Sep 13, 2009 --> p>/p> hr classhr-black> p>/p> !-- This tag specifies an image file to be displayed on the page --> div classdiv-center> a hrefcu.htm>img SRCimages2/cu.gif ALTCURTA Logo height127 width249>/a> a hrefhp.htm>img SRCimages2/hpc2.gif ALTHewlett Packard Logo height97 width374>/a> a hrefti.htm>img SRCimages2/ti.gif ALTTexas Instruments Logo height70 width360>/a> /div> hr classhr-black> hr classhr-black> /td> /tr> tr> td stylepadding-left: 10px; width:200px;background-color:#C0C0C0; text-align: left; vertical-align:top; > img srcimages2/200x10-Transparent-Image32.png alt> !-- Keeps column from colapsing on narrow screens--> div classdiv-center> a hrefhp-need.htm>img SRCimages2/HP/HP-firsthpstn.gif ALTFirst HP height112 width150>/a> p>/p> h3>b>a hrefindex.html>Home/a>/b>/h3> /div> p>/p> small>a href#posters> Posters for Sale/A>/small>br> small>a href#otherposters> Other Great Posters/A>/small>br> small>a href#newspaper> Newspaper Article/A>/small>br> small>a href#faqs> Frequently Asked Questions/A>/small>br> small>a href#fswant> Calculator Lists/A>/small>br> small>a href#free42> HP-42S for the PC/A>/small>br> small>a href#calc98> Calc98 for the PC/A>/small>br> small>a href#desktop> Desktop Calculators/A>/small>br> small>a href#keyboard> Keyboard Trivia/A>/small>br> small>a href#display> Electronic Displays/A>/small>br> small>a href#numbers> Calculator Numbers/A>/small>br> small>a href#CGPC> Collectors Guides/A>/small>br> small>a href#othersites> Other Links/A>/small>br> !--small>a hrefWhatsNew.htm> Whats New/A>/small>br>--> !--small>a href#ring> Calculator Ring/A>/small>br>--> p>/p> hr classhr-black> p>/p> div classdiv-center> a hrefcu.htm>img SRCimages2/cu-ico.gif ALTCurta Icon height100 width60>/a>br> h3>b>a hrefcu.htm> Curta/a>/b>/h3> /div> p>/p> small>B>Posters/B>/small>br> small> A hrefcu.htm#Curta-Poster>The Curta Poster/A>/small>br> small>B>Owners Registry/B>/small>br> small> A hrefcu-peo.htm>Curta Registry/A>/small>br> small>B>Curt Herzstark/B>/small>br> small> A hrefcu.htm#curt>Curt Herzstark/A>/small>br> small> A hrefcu.htm#babbage>Curt Herzstark Interview/A>/small>br> small>B>Curta Simulators/B>/small>br> small> A hrefcu.htm#veesim>Olaf Veenstras/A>/small>br> !-- small> A hrefcu.htm#sim>Jan Meyers/A>/small>br> small> A hrefcu.htm#patsim>Pat Belfords/A>/small>br> --> small>B>Technical/B>/small>br> small> A hrefcu.htm#stats>Curta Stats/A>/small>br> small> A hrefcu.htm#variations>Curta Variations/A>/small>br> small> A hrefcu.htm#manual>Curta Manual/A>/small>br> small> A hrefcu.htm#date>Curta Date/A>/small>br> small> A hrefcu.htm#dim>Curta: Dimensions & Timing/A>/small>br> small> A hrefcu.htm#disassy>Curta Disassembly/A>/small>br> small> A hrefcu.htm#patents>Curta Patents/A>/small>br> small> A hrefcu.htm#tools>Curta Tools/A>/small>br> small> A hrefcu.htm#lube>Curta Lubrication/A>/small>br> small> A hrefcu.htm#documents>Curta Repair Manuals/A>/small>br> small> A hrefcu.htm#repair>Jacks Curta Repair (US)/A>/small>br> small> A hrefcu.htm#hans>Hans Curta Repair (Europe)/A>/small>br> small> A hrefcu.htm#italy>Romanos Curta Repair (Italy)/A>/small>br> small>B>Collections/B>/small>br> small> A hrefcu.htm#hga>Curta: The Ayen Collection/A>/small>br> small>B>Curta Pictures/B>/small>br> small> A hrefcu.htm#oldest>Curta: Oldest/A>/small>br> small> A hrefcu.htm#nice>Curta Photos/A>/small>br> small> A hrefcu.htm#ray>Curta: Ray Traced/A>/small>br> small>B>Curta Demos/B>/small>br> small> A hrefcu.htm#demo> Curta Demos/A>/small>br> small> A hrefcu.htm#special>Curta: Cut & Special/A>/small>br> small> A hrefcu.htm#prototype>Curta Prototypes/A>/small>br> small>B>Curta Literature/B>/small>br> small> A hrefcu.htm#ads>Curta Ads/A>/small>br> small> A hrefcu.htm#documents>Curta Documents/A>/small>br> small> A hrefcu.htm#news>Curta E-mails/A>/small>br> small> A hrefcu.htm#litreature>Curta Literature/A>/small>br> small>B>Articles/B>/small>br> small> A hrefcu.htm#backup>Curta Backup Article/A>/small>br> small> A hrefcu.htm#cupemag>Miniature Machine/A>/small>br> small> A hrefcu.htm#rally>Curta: Rally/A>/small>br> small> A hrefcu.htm#curta-art>Curta Articles/A>/small>br> small>B>Curta Other/B>/small>br> small> A hrefcu.htm#pins>Curta Pins/A>/small>br> small> A hrefcu.htm#school>Curta Museums & School/A>/small>br> small> A hrefcu.htm#media>Curta: Media/A>/small>br> small> A hrefcu.htm#book>- Books/A>/small>br> small> A hrefcu.htm#stamp>- Stamp/A>/small>br> small> A hrefcu.htm#audio>- Audio/A>/small>br> small> A hrefcu.htm#video>- Video/A>/small>br> small>B>Curta Links/B>/small>br> small> A hrefcu.htm#links>Curta Links/A>/small>br> p>/p> hr classhr-black> p>/p> div classdiv-center> a hrefhp.htm>img SRCimages2/hp-ico.gif ALTHP Icon height100 width60>/a>br> h3>b>a hrefhp.htm> Hewlett Packard/a>/b>/h3> /div> p>/p> small>a hrefhp-need.htm> HPs Needed /A>/small>br> small>a hrefhp.htm#wlodek> HP Guide/A>/small>br> small>a hrefhp-11.htm> Inside a HP-11/A>/small>br> small>a hrefhp-95.htm> About a HP-95/A>/small>br> small>a hrefhp-code.htm> HP Microcode/A>/small>br> small>a hrefhp-35.htm> Made in USA/A>/small>br> small>a hrefhp-rick.htm> The HPs/A>/small>br> small>a hrefhp-date.htm> HP Dates/A>/small>br> small>a hrefhp-weig.htm> HP Weights/A>/small>br> small>a hrefhp-30dr.htm> 30 Series Derivations/A>/small>br> small>a hrefhp-jrnl.htm> HP Publications/A>/small>br> small>a hrefhp-jhi.htm> HP Articles/A>/small>br> small>a hrefhp.htm#hpnames> HP Codenames/A>/small>br> hr classhr-black> p>/p> div classdiv-center> a hrefti.htm>img SRCimages2/ti-ico.gif ALTTI Icon height100 width60>/a>br> h3>b>a hrefti.htm> Texas Instruments/a>/b>/h3> /div> p>/p> small>a hrefti-need.htm> TIs Needed/A>/small>br> small>a hrefti-hist.htm> TI History/A>/small>br> small>a hrefti-accry.htm> TI Accuracy/A>/small>br> small>a hrefti-newer.htm> Later TIs/A>/small>br> small>a hrefti-games.htm> TI Games/A>/small>br> small>a hrefti-articles.htm> TI Articles/A>/small>br> /td> td stylepadding: 15px; border:1px solid black; text-align: left; vertical-align: middle> div classtext-center> h1> !--a hrefwave/add-mach.wav>--> Welcome to The Calculator Reference !--/a>--> /h1> /div> p> Here you will find a wealth of data I have collected over the years on general calculators, HPs calculators, TIs calculators, and on my all time favorite mechanical calculator, the a hrefcu.htm>CURTA/a>. /p> p> I recent years I have become an expert with the amazing Curta calculator. And its mechanical not electronic! But it represents a final ultimate, state-of-the-art achievement in the mechanical world before the electronic calculator revolution took over and over night obsoleted all mechanical machines. Interestingly the Curta held on for many years because it was so popular among road rallyest and surveyors. /p> p> I do collect and study the manufacturing variations of the two models of the Curta calculator. My two A HREFcu.htm#Curta-Poster >exploded view Curta posters/a> are wildly popular around the world and have been featured in museum displays and displayed in the halls and offices of NASA. /p> p> My favorite electronic calculators are HPs but I dont plan on this page even starting to compete with a hrefhttp://www.hpmuseum.org>The Museum!/a> HP introduced the 1st scientific calculator (HP-35) then introduced the first business calculator (HP-80). To this day the all time most popular calculator is the HP-12 Business calculator. I still like to gripe about why HP abandoned the scientific calculator (HP-11, HP-15) in this wonderfully convenient format. /p> p> My A HREFhp.htm#HP-Poster >Calculators of HP poster/a> is another popular poster I created. It even serves as a reference in the support offices of HP. /p> p> Finally my newest posters of the A HREFothercoolstuff.htm#telephone >History of the Telephone/a> and A HREFothercoolstuff.htm#currency >Modern US Currency/a> are the latest additions to my poster line up. Yes, a slight deviation from calculators but I always remembered touring the phone company as a child and receiving a poster that showed the history of the telephone. My Telephone poster is an updated tribute to this now 45 year old poster. /p> p> I also find the art and design that is in the US currency amazing. My A HREFothercoolstuff.htm#currency >Modern US Currency poster/a> arranges all the major version of all the denominations. Showing both the front and back side of each bill so you can study and appreciate the art and changes that have happened to the US currency over the past 100 years or so. I also hope this poster can serve as a teaching aid for school teachers. /p> p> Look around, enjoy yourself, and marvel over how calculators (both steel and silicon) have changed our world. /p> p> i>a hrefmailto:rfurr@vcalc.net>-Rick Furr-/a>/i> a IDposters>/a> /p> hr classhr-black> hr classhr-black> div classdiv-center> H1>NOW SIX POSTERS ARE FOR SALE!!!/H1> /div> table classtable-center> tr> td COLSPAN2> div classdiv-center> A HREFothercoolstuff.htm#morse-code > h1>b>Morse Code/b>/h1> IMG SRCimages2/Posters/MorseCode-Poster-1.1.4a-420x315.jpg AltMorse Code Classimg-poster Width420 Height315>br> Click Here /A> p>/p> /div> /td> /tr> tr> td COLSPAN2> div classdiv-center> A HREFothercoolstuff.htm#telephone > h1>b>The Telephone Story/b>/h1> IMG SRCimages2/Posters/Telephone-Poster-420x280.jpg AltThe Telephone Story Classimg-poster Width420 Height280>br> Click Here /A> p>/p> /div> /td> /tr> tr> td COLSPAN2> div classdiv-center> A HREFothercoolstuff.htm#currency > h1>b>Modern US Currency/b>/h1> IMG SRCimages2/Posters/Currency-Poster-420x272.jpg AltModern US Currency Classimg-poster Width420 Height272>br> Click Here /A> p>/p> /div> /td> /tr> tr> td> div classdiv-center> A HREFcu.htm#Curta-Poster > h1>b>The Curta Poster/b>/h1> IMG SRCimages2/Posters/Curta-Poster-Master18s-400x256.jpg AltCurta Poster Classimg-poster Width400 Height256>br> Click Here /A> /div> /td> td> div classdiv-center> A HREFhp.htm#HP-Poster > h1>b>The HP Poster/b>/h1> IMG SRCimages2/Posters/HP-Poster-HpCALCS-200-300x400.jpg AltHP Poster Classimg-poster Width300 Height400>br> Click Here /A> p>/p> /div> /td> /tr> tr> td COLSPAN2> div classdiv-center> A HREFcu.htm#german > h1>b>The Curta German Poster/b>/h1> IMG SRCimages2/Posters/Curta-German-Poster-Master21G-420x273.jpg AltCurta Poster in German Classimg-poster Width420 Height273>br> Click Here p>/p> /A> /div> /td> /tr> /table> The Calculator Reference is proud to now offer SIX fabulous posters. The wildly popular Curta Calculator poster, the Curta German poster, the Calculators of HP poster (version 2), The Telephone Story, Modern US Currency, and Morse Code. Click on any picture to learn more.... i>-Rick-/i> p>/p> A IDotherposters>/a> hr classhr-black> div classdiv-center> H2>OTHER GREAT POSTERS/H2> /div> table classtable-center> tr> td COLSPAN2> A HREFotherposters.htm#electronic target_blank> IMG SRCimages2/Posters-Other/Electronic-Components-Poster-794.jpg altElectronic Components poster Classimg-poster> /a> p>/p> /td> /tr> tr> td classcentered> A HREFotherposters.htm#elements target_blank> IMG SRCimages2/Posters-Other/Elements-tn2.JPG altElements Classimg-poster> /a> p>/p> A HREFotherposters.htm#taxes target_blank> IMG SRCimages2/Posters-Other/Fed-Budget-Death-tn2.jpg altDeath Classimg-poster> /a> /td> td> A HREFotherposters.htm#electro target_blank> IMG SRCimages2/Posters-Other/Electro-Magnetic-full-tn2.jpg altElectro Classimg-poster> /a> /td> /tr> /table> table classtable-center centered> tr> td classcentered> A HREFotherposters.htm#color target_blank> IMG SRCimages2/Posters-Other/visibone-kilochart_900r.jpg altKilo Classimg-poster> /a> A HREFotherposters.htm#color target_blank> IMG SRCimages2/Posters-Other/visibone-postr546r.jpg altcolor1 Classimg-poster> /a> /td> /tr> tr> td> A HREFotherposters.htm#color target_blank> IMG SRCimages2/Posters-Other/visibone-chart_847r.jpg altcolor2 Classimg-poster> /a> A HREFotherposters.htm#color target_blank> IMG SRCimages2/Posters-Other/visibone-htcht_840r.jpg altcolor3 Classimg-poster> /a> /td> /tr> tr> td classcentered> A HREFotherposters.htm#country target_blank> IMG SRCimages2/Posters-Other/visibone-countrychart_2040r.jpg altcc Classimg-poster> /a> p>/p> /td> /tr> /table> div classdiv-center> b>(Click On A Poster)/b> p>/p> Here are links to some of my favorite posters that other people have created. Click on a poster to learn more. /div> hr classhr-black> A IDnewspaper>/a> div classdiv-center> H2>NEWSPAPER ARTICLE/H2> /div> A HREFimages2/NRV-CurrentArticle-051126c.jpg target_blank> div classdiv-center> IMG SRCimages2/NRV-CurrentArticle-051126cc.jpg AltNRV Article Classimg-poster>br> b>(Click Here)/b> p>/p> /div> /a> Heres an article that was in the newspaper about my calculator collection. In the photo the newspaper photographer wanted me to be surrounded by some of my calculators. So we arranged a ping-pong table in the background and a card table in the foreground. Then we placed two wide boards on either side so there was a small hole in the center. Next we placed all the calculators we could fit on the tables and then I squoze into the center for the photo shoot. p>/p> It made for a cool shot but sadly the photographer would not give me the original. p>/p> hr classhr-black> div classdiv-center> H2>HP CALCULATORS/H2> a hrefhp.htm#hp32c> IMG SRCimages2/HP/HP-035S-HP35S-front-tn.jpg AltHewlett Packard 35s > IMG SRCimages2/HP/hp33c-14g-320x206.jpg AltHewlett Packard 33c Width320 Height206 > IMG SRCimages2/HP/HP12CPlatinum320x208.jpg AltHewlett Packard 12cp Width320 Height208 > /a> p>/p> Learn more about the HP-12C Platinum, HP-32C, and the HP-33CS on the a hrefhp.htm#hp32c>HP Reference page/a>. /div> p>/p> a IDfaqs>/a> hr classhr-black> p>/p> table stylewidth: 100%;> tr> td stylewidth: 200px;> div classdiv-center> a hreffaq.htm> img srcimages2/faq.jpg altfaq width134 height76> /a> /div> /td> td> a hreffaq.htm> h2>B>HELP!!!/B>BR> Frequently Asked Questions/h2> /a> Here are places that will help you with your most frequently asked questions concerning repairs, spare parts, and manuals. p>/p> /td> /tr> tr> td colspan2> hr classhr-black>br> /td> /tr> tr> td> a IDfswant>/a> a hreffs-want.htm> img srcimages2/bookstn.jpg altfs width188 height141> /a> /td> td> a hreffs-want.htm> h2>Calculator Collectors, Data, Classifieds, Mail Distribution Lists, and Forums/h2> /a> The title says it all, this is a collection of Collector Lists, Data Lists, Classified Lists, Mail Distribution Lists, and Forums. p>/p> If you are wanting to buy or sell a calculator then reference the Classified Lists, Mail Distribution Lists, and Forums section. p>/p> /td> /tr> tr> td colspan2>hr classhr-black>br>/td> /tr> tr> td> a hrefhttp://www.calculator.org/ target_blank> img SRCimages2/HP-Free-42-Image6-106x208.jpg altFree 42 width106 height208> /a> /td> td> a IDfree42>/a> a hrefhttps://thomasokken.com/free42/ target_blank> h2>Free 42 (HP-42S for your PC)/h2> /a> table classtable-pad5> tr> td> a hrefhttps://thomasokken.com/free42/ target_blank> img srcimages2/HP-Free-42-photo-icon-192x192.png altDownload Free-42 (Free) width192 height192> /a> /td> td> Free42 is a re-implementation of the HP-42S Scientific Programmable Calculator and HP-82240 Printer. p>/p> It is a complete rewrite, not using any HP code. It does not require an HP-42S ROM image. p>/p> Even though it contains significant enhancements compared to the original calculator, Free42 remains fully compatible with the HP-42S, both in its user interface and in its ability to run programs written for the HP-42S. p>/p> Free42 is an Open Source project. The executables and source code are released under the terms of the GNU General Public License, version 2. /td> /tr> /table> /td> /tr> tr> td colspan2>hr classhr-black>br>/td> /tr> tr> td> a hrefhttp://www.calculator.org/ target_blank> img SRCimages2/Calc98CD-Packshot-188x140.jpg altc98 width188 height140> /a> /td> td> a IDcalc98>/a> a hrefhttp://www.calculator.org/ target_blank> h2>Calc 98/h2> /a> a hrefhttp://www.calculator.org/ target_blank> img srcimages2/c98now-88x31.jpg altDownload Calc98 (Free) width88 height31> /a> 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). /td> /tr> tr> td colspan2>hr classhr-black>br>/td> /tr> tr> td> a IDdesktop>/a> a hrefdt.htm> img SRCimages2/sharpdt.jpg Altsharpdt height100 width154> /a> /td> td> a hrefdt.htm> h2>Desktop Calculators/h2> /a> Here is some information on some very interesting and some very common desktops that I own. p>/p> /td> /tr> tr> td colspan2>hr classhr-black>br>/td> /tr> tr> td> a IDkeyboard>/a> a hrefkeyboard.htm> img SRCimages2/keypads2-188x105.gif altkeypad width188 height105> /a> /td> td> a hrefkeyboard.htm> h2>Keyboard Trivia/h2> /a> p>/p> B>Why is the telephone touch-tone key pad arranged differently from the calculator key pad?/B> p>/p> B>Why is the keypad arrangement different for a telephone and a calculator?/B> p>/p> B>Doing the Numbers - Why Calculator and Phone Number Layouts Differ/B> p>/p> /td> /tr> tr> td colspan2>hr classhr-black>br>/td> /tr> tr> td> a IDdisplay>/a> a hrefdisplay2.htm> img SRCimages2/Display/nixietn.gif altnixie height135 width188> /a> /td> td> a hrefdisplay2.htm> h2>Electronic Displays/h2> /a> This is my article on Electronic Displays that appeared in the Winter-Spring 1997 a hrefhttp://www.vintagecalculators.com/html/calculator_articles.html>International Calculator Collector/a>. p>/p> /td> /tr> tr> td colspan2>hr classhr-black>br>/td> /tr> tr> td> a IDnumbers>/a> a hrefimages2/numbers.gif> img SRCimages2/numbertn.gif altnumnertn height106 width162> /a> /td> td> a hrefimages2/numbers.gif> h2>The Calculating Machines Numbers/h2> /a> If youve ever been to !--a hrefhttp://www.webcom.com/calc/>--> a hrefhttps://web.archive.org/web/20050204000414/http://www.webcom.com/calc/>Erez Kaplans -- Calculating Machines/a> page (now available at the Wayback Machine--thanks Angelica Landicho) 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. p>/p> /td> /tr> tr> td colspan2>hr classhr-black>br>/td> /tr> tr> td> a hrefimages2/pc-bk.jpg> img SRCimages2/pc-bktn.jpg altpcpktn height208 width135> /a> /td> td> a IDCGPC>/a> a hrefimages2/pc-bk.jpg> h2>The Collectors Guide to Pocket Calculators/h2> /a> i>This is another must have for ANY calculator collector. - Rick Furr./i> p>/p> b> a hrefimages2/pc-bk.jpg>The Collectors Guide to Pocket Calculators/a> /b> 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 1970s (the Golden Age of Pocket Calculators), as well as historical information from the 1960s and 1970s. p>/p> 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). p>/p> b> a hrefimages2/pc-bk.jpg>The Collectors Guide to Pocket Calculators/a> /b> also includes a comprehensive value guide to help you gauge rarity and desirability of the various models -- especially as they relate to each other. p>/p> 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. p>/p> Mail to: address> b>Wilson/Barnett Publishing/b>/address>br> P.O. Box 345br> Tustin, CA 92781-0345br> USA p>/p> For additional information, contact a hrefmailto:mrcalc@usa.net>Guy Ball/a> p>/p> /td> /tr> /table> p>/p> a IDothersites>/a> hr classhr-black> h1 styletext-align:center;>Other Links/h1> h2>CURTA/h2> UL> li> a hrefcu.htm> The CURTA Reference /a> a hrefmailto:rfurr@vcalc.net> by Rick Furr /a>br> a hrefcu.htm> img srcimages2/Links/Link-Vcalc.jpg altlinks>br>br> /a> /li> li> A hrefcu.htm>See the Curta Page for more links/a> /li> /UL> a IDcalctech>/a> h2>CALCULATORS/h2> UL> li> a hrefhttp://www.machineacalculer.fr target_blank> Christophe Merys Calculating Machine Documentsbr> img Srcimages2/Links/Link-Calculating-Machine-Documents-210325-Image112.jpg altmachinea >br>br> /a> !--christophe mery mery.christophe@wanadoo.fr> --> /li> li> a hrefhttp://www.calculators.szrek.com target_blank> Calculators Pages by Walter Szrekbr> img Srcimages2/Links/Link-CalculatorsPages.jpg altcalcpage >br>br> /a> !--walter@szrek.com--> /li> li> a hrefhttp://www.calcmuseum.com target_blank> Calculator History and Technology Archive Page by Alex Knightbr> img Srcimages2/Links/Link-Calculator-History-and-Technology-Archive-Page-by-Alex-Knight-Image49.jpg altchist >br>br> /a> !--calc01@calcmuseum.com--> /li> li> a hrefhttp://www.calcinfo.com/ target_blank> Calculator Technical Information by Mike Sebastianbr> img Srcimages2/Links/Link-CalculatorTechnicalInformation.jpg altcinfo>br>br> /a> !--mwsebastian@calcinfo.com--> /li> !-- li> a hrefhttp://www.cs.ualberta.ca/~smillie/Calculators/Calculators.html target_blank> Computation: From Abacus to Silicon Chip by Keith Smilliebr> img Srcimages2/Links/Link-Computation-From Abacus to Silicon Chip by Keith Smillie-Image50.jpg altualberta >br>br> /a> smillie@cs.ualberta.ca /li> --> li> a hrefhttp://www.balsach.com/LLIBRE%20JPG/INDEX%20SOLO.htm target_blank> HISTORY OF THE CALCULATOR - by Josep Balsachbr> img Srcimages2/Links/Link-History-of-Calcs.jpg althoc >br>br> /a> /li> li> a hrefhttp://www.calculators.de/ target_blank> Museum of Pocket Calculating Devices by Gerhard Wenzelbr> img Srcimages2/Links/Link-Calculators.de.jpg altcde >br>br> /a> !--wenzel@calculators.de--> /li> li> a hrefhttp://www.rskey.org/gene/hpgene/index.html target_blank> Old HP and TI Calculators by Gene Wrightbr> img Srcimages2/Links/Link-OldHPandTICalculators.jpg althpg>br>br> /a> !--GeneWright143@hotmail.com--> /li> li> a hrefhttp://www.rskey.org/ target_blank> Programmable Calculators by Viktor T. Tothbr> img Srcimages2/Links/Link-ProgrammableCalculators.jpg altrskey >br>br> /a> !--vttoth@vttoth.com--> /li> li> a hrefhttp://oldcalculatormuseum.com/ target_blank> The Old Calculator Web Meseum by Rick Bensenebr> img Srcimages2/Links/Link-TheOldCalculatorWebMuseum.jpg altoldc >br>br> /a> !--oldcalcs@bensene.com--> /li> li> a hrefhttp://www.vintagecalculators.com/ target_blank> Vintage Calculators Web Page by Nigel Toutbr> img Srcimages2/Links/Link-VintageCalculatorsWebMuseum.jpg altvintcalc>br>br> /a> !--nigel.tout@vintagecalculators.com--> /li> /ul> h2>Mechanical Info/h2> ul> li> a hrefhttp://www.rechenmaschinen-illustrated.com/ target_blank> Calculating Machines - Illustrated by Herbert & Walterbr> img Srcimages2/Links/Link-Calculating-Machines-Illustrated-190326.jpg altrechen>br>br> /a> !--web-master@Rechenmaschinen-Illustrated.com--> /li> li> a hrefhttp://www.bluemich.net/rechner/ target_blank> Mechanische Rechenhilfsmittel (Mechanical Calculating Equipment) by Wolf-G. Blümichbr> img Srcimages2/Links/Link-Mechanical-Calculating-Equipment.jpg altrechner>br>br> /a> !--wolf@bluemich.net--> /li> /UL> h2>HP/h2> UL> li> a hrefhp.htm> The HP Reference /a> a hrefmailto:rfurr@vcalc.net> by Rick Furrbr> /a> a hrefhp.htm> img srcimages2/Links/Link-Vcalc.jpg altlinks >br>br> /a> /li> li> a hrefhttp://www.thecalculatorstore.com target_blank> The Calculator Store (Barcelona, Spain) by Jose Gonzalezbr> img SRCimages2/Links/Link-TheCalculatorStore-tn.jpg alttcs >br>br> /a> /li> li> a hrefhttp://www.cscenter.com.br target_blank> HP calculators in Brazil by Williambr> img SRCimages2/Links/Link-CSCenter.jpg altcsc >br>br> /a> !--ibadan.terra.com.br--> /li> li> a hrefhttp://hp15c.org/ target_blank> Bring Back the HP-15C by Chris Wbr> img SRCimages2/Links/Link-Bring-Back-The-15C.jpg althp15c>br>br> /a> !--a hrefmailto:cdw3423@cox.net>/A>--> /li> li> a hrefhttp://www.hp41.org/ target_blank> HP-41 PROGRAMMABLE CALCULATOR by Warren Furlowbr> img SRCimages2/Links/Link-HP-41-PROGRAMMABLE-CALCULATOR-by-Warren-Furlow-41Drawing.jpg althp41 >br>br> /a> !--warren@furlow.org--> /li> li> a hrefhttp://www.hpcc.org/ target_blank> HPPC - HANDHELD AND PORTABLE COMPUTER CLUB by HPPC (formerly PPC (UK))br> img SRCimages2/Links/Link-HPCC.org.jpg althpcc >br>br> /a> !--mark.power@btinternet.com--> /li> li> a hrefhttp://www.cs.uiowa.edu/~jones/hp/battery/ target_blank> Making New Battery Packs for the HP-35 Calculator by Douglas W. Jonesbr> img SRCimages2/Links/Link-Making-New-Battery-Packs-for-the-HP-35-Calculator-by-Douglas-W.-Jones-fig1.gif althpbatt >br>br> /a> !--jones@cs.uiowa.edu--> /li> li> a hrefhttp://www.hpmuseum.org/ target_blank> The Museum of HP Calculators by Dave Hicksbr> img SRCimages2/Links/Link-TheMuseumOfHPCalculators.jpg althpmus >br>br> /a> !--dgh@hpmuseum.org--> /li> /UL> h2>TI/h2> UL> li> a hrefti.htm> The TI Reference /a> a hrefmailto:rfurr@vcalc.net> by Rick Furrbr> /a> a hrefti.htm> img srcimages2/Links/Link-Vcalc.jpg altti >br>br> /a> /li> li> a hrefhttp://www.datamath.org/ target_blank> DATAMATH CALCULATOR MUSEUM by Joerg Woernerbr> img SRCimages2/Links/Link-Datamath.jpg altdatam >br>br> /a> !--joerg@datamath.org--> /li> li> a hrefhttps://ti84onlinecalculator.com/ target_blank> TI 84 Online Calculator by Marcusbr> img SRCimages2/Links/Link-TI-84-Image4.jpg altdatam >br>br> /a> !-- support@ti84onlinecalculator.com --> /li> /UL> h2>SLIDE RULES/h2> UL> li> a hrefhttp://www.moonstick.com/ target_blank> The Moonstick by Sean Bartonbr> img SRCimages2/Links/Link-moonstick_224x112.jpg altmoons >br>br> /a> !--sean.barton@moonstick.com--> /li> li> a hrefhttp://www.oughtred.org/ target_blank> The Oughtred Society by Jon J Cvernabr> img SRCimages2/Links/Link-TheOughtredSociety.jpg altought >br>br> /a> !--X--> /li> li> a hrefhttp://www.sphere.bc.ca/test/sruniverse.html target_blank> The Slide Rule Universe by Walterbr> img SRCimages2/Links/Link-TheSlideRuleUniverse.jpg altsrun >br>br> /a> !--walter2@sphere.bc.ca--> /li> /UL> h2>OTHER/h2> UL> li> a hrefhttps://pigly.com/calculators/for-kids/ target_blank> Piglybr> img SRCimages2/Links/Link-Pigly-logo-210223.png altfork >br>br> /a> !--Angelica Landicho angelica@pigly.org>--> Pigly is a free math and finance guide offering over 100 interactive calculators to help teach students about math and money. p>/p> We also created a featured guide about the history of calculators for kids which shows all the different ways we use calculators in our day to day lives. /li> li> a hrefhttps://www.had2know.com/ target_blank> Had TO Knowbr> img SRCimages2/Links/Link-Had-To-Know-210315-Image115.jpg althad2 >br>br> /a> !--Samuel Pearl administrator@had2know.com>--> Had2Know.com delivers information and online calculators for a wide variety of applications – finance, science, home & garden, mathematics, health & fitness, games, and much more. Is there something you just had to know? We hope we have what youre looking for. Put our extensive collection of online calculators to use, or browse our expertly written articles and how-to guides.br/>br/> /li> li> a hrefhttps://www.businesspundit.com/everyday-financial-calculators/ target_blank> Everyday Financial Calculatorsbr> img SRCimages2/Links/Link-Everyday-Financial-Calculators-201223-Image41.jpg alteveryday >br>br> /a> !--Gloria Murdoch gloria.murdoch@stemx.org>--> /li> li> a hrefhttps://www.easyunitconverter.com/ target_blank> Easy Unit Converterbr> img SRCimages2/Links/Link-Easy-Unit-Converter-201223-Image38.jpg alteasyunit >br>br> /a> !--webmaster@easyunitconverter.com--> /li> li> a hrefhttp://tmaker.site/ target_blank> Table/Maker Fivebr> img SRCimages2/Links/Link-Tmaker5-201223-Image39.jpg alttmaker >br>br> /a> !--Peter Roizen roizen@ix.netcom.com>--> /li> li> a hrefhttp://www.calculatoredge.com target_blank> Calculators Edge Web Page - Lots of web based calculator solutions by Rick Modibr> img Srcimages2/Links/Link-CalculatorEdge-tn.jpg altcalcedge >br>br> /a> !--walter@szrek.com--> /li> li> a hrefhttps://goodcalculators.com/ target_blank> A collection of really good online calculators for use in every day domestic and commercial use! by John Sbr> img SRCimages2/Links/Link-Good-Calculators.jpg altgoodc >br>br> /a> !-- John S goodcalculators@gmail.com> --> /li> li> a hrefhttps://www.allaboutcircuits.com/ target_blank> Since its founding in 2003, AAC has grown into one of the largest online electrical engineering communities. by Kent Dresserbr> img SRCimages2/Links/Link-All-About-Circuits.jpg altallab >br>br> /a> !-- Kent Dresser kent@eetech.com> --> /li> li> a hrefhttp://www.sphere.bc.ca/test/nixie.html target_blank> The Nixie Universe by Walterbr> img SRCimages2/Links/Link-TheNixieUniverse.jpg altnixie >br>br> /a> !--walter2@sphere.bc.ca--> /li> li> a hrefhttp://www.arttec.net/art/Relevators.html target_blank> Electronic Artwork by Guy Marsdenbr> img SRCimages2/Links/Link-S-S-on-wall.jpg altrelev >br>br> /a> !--guy@arttec.net--> /li> !-- li> a hrefhttp://www.shsu.edu/~csc_tjm/ target_blank> Dr. Timothy J. McGuire by Dr. Timothy J. McGuirebr> img SRCimages2/Links/Link-Dr. Timothy J. McGuire-Image51.jpg alt >br>br> /a> csc_tjm@shsu.edu?subjectSuggestedLink /li> --> !-- li> a hrefhttp://www.hitmill.com/college/math.html target_blank> Significant Math Links by Significant Math Linksbr> img SRCimages2/Links/Link-Significant Math Links by Significant Math Links-Image47.jpg alt >br>br> /a> webmaster@hitmill.com /li> --> /UL> h2>RALLY/h2> UL> li> a hrefhttp://www.rallyracingnews.com/manuals/index.html target_blank> Rally Racing News -- Rally Odometer/Clock Manuals by Bill Jonesibr> img SRCimages2/Links/Link-RallyRacingNews.jpg altrally >br>br> /a> !--jonesi@pcmagic.net--> /li> li> a hrefhttp://www.rallyracingnews.com/manuals/curtaman.html target_blank> PEPPERMILL OPERATIONS (15 Place Curta)BR> A Rallyists Guide for the Use and Operation of a Curta Calculator by Diane E. Housealbr> img SRCimages2/Links/Link-PEPPERMILL-OPERATIONS-Image48.jpg altcurtam >br>br> /a> !--Tim@winktimber.com--> /li> /UL> h2>For Sale/h2> ul> li> a hrefhttp://www.gemmary.com/ target_blank> Antique Scientific Instruments on the Internet -- The Gemmary by R.C. Blankenhorn & Vince Austinbr> img SRCimages2/Links/Link-TheGemmary.jpg altgemmary >br>br> /a> !--X--> /li> /ul> !-- a ID#whatsnew>/a> a hrefWhatsNew.htm> h2>Whats New/h2> /a> Information about what changed at the Calculator Reference --> br> br> hr classhr-black> hr classhr-black> The Calculator Reference by A HREFmailto:rfurr@vcalc.net?subjectVCALC:>Rick Furr (rfurr@vcalc.net)/A> hr classhr-black> A HREF#top>Back to the top of The Calculator Reference/A> /td> /tr> /table> /body>/html>
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