Bomis: The Recreation/Collecting/Computers/Calculators Ring
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    1.Vintage Calculators
     A celebration of old calculators showing the evolution from mechanical calculator to hand held electronic calculator.
    www.vintagecalculators.com
    2.Mechanical Calculating Machines
     Mechanical calculating machines from a collector's point of view, with articles and links to relevant sites.
    www.webcom.com
    3.The Museum of HP Calculators
     Information about every HP calculator made since 1968. Includes photo gallery, old advertisements, operating instructions, pricing information and discussion forum.
    www.hpmuseum.org
    4.Museum of Pocket Calculating Devices
     A gallery containing many varieties of pocket calculators, slide rules, and abacuses.
    www.calculators.de
    5.Calculator Technical Information
     Technical information about many calculators, including chip pinouts and self-test sequences, and patent information.
    www.calcinfo.com
    6.Museum of Soviet Calculators
     Displays handheld and desktop calculators from the 1900s to the present, showing interesting features of each.
    www.taswegian.com
    7.Be Calc
     Serge Devidts' collection of vintage electronic calculators and some other pieces of old technology.
    www.devidts.com
    8.Programmable Calculators
     A collection of programmable and non-programmable calculators and accessories, with articles and repair notes.
    www.rskey.org
    9.EEC - Early Electronic Calculator Technology Reference
     A source of information about the technology used in the construction of early electronic calculators. Includes a reverse-engineering project.
    www.cs.ubc.ca
    10.Gregory Escov's homepage
     Some articles about Russian made calculators, including undocumented features and error conditions.
    members.tripod.com
    11.Datamath Calculator Museum
     An overview of the calculators manufactured by Texas Instruments Inc. from the famous Datamath (1972) to the modern Graphics calculators, with history and articles.
    www.datamath.org
    12.Yahoo! Groups : oldcalcs
     Bulletin board for collectors of old electronic calculators.
    groups.yahoo.com
    13.Calculator Collecting
     Webring designed to allow navigation between similar sites dealing with the hobby of collecting, and history of electronic calculators.
    k.webring.com
    14.Stellatron Calculators
     An A-Z index of manufacturers, with product photographs, and a timeline of model releases.
    website.lineone.net
    15.Retrokit
     Photographs of some older calculator models.
    www.tozzo.freeserve.co.uk
    16.Vintage Calculators
     Information and lists of vintage and classic calculators, primarily Hewlett-Packard and Texas Instruments.
    www.decodesystems.com
    17.Casio FX-700P Programmable Calculator
     Technical information about hardware, interfacing, and programming of this vintage device. Includes a construction project for a storage device to emulate the original FA-3 cassette interface.
    www.pisi.com.pl
    18.Collection of Calculators, Portable Computers and Vintage Electronics
     Calculators from the '70s, and famous home and personal computers from '80s. Photos, historic information and links to other resources.
    web.tiscali.it
    19.The Famous Slide Rule Page
     Pictures and descriptions of The Castell Addiator and The Rapid-Calcolo.
    www.geocities.com
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