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- Early Electronic Calculator Technology Reference - www.cs.ubc.ca/~hilpert/eec/ - Technical data for electronic calculators manufactured from the 1960s to the early 1970s is difficult to come by and most of these machines utilized proprietary and now obsolete integrated circuits. For SSI-based calculators, technical data is useful and often a necessity if one wishes to repair such units. This is a truly fascinating website with in depth reverse engineering and simulations of old electronic calculators. Lots of detailed data on obsolete integrated circuits that are used as the guts for calculators from the late 1960's and early 1970's.
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- The Old Calculator Web Museum - www.oldcalculatormuseum.com - This museum is simply devoted to preserving, documenting, and sharing the technology of desktop automatic calculating machines -- from the electro-mechanical calculators of the 1950's and '60's, through the beginnings of the pocket wonders we have today, which had their roots in the early 1970's, and on into the beginnings of the desktop computer of the mid-1970's through the early 1980's.
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- robotrontechnik - www.robotrontechnik.de - Rüdiger Kurth's excellent website about the Robotron brand, production facilities and products.
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- Serge Devidts - www.devidts.com/be-calc - Based in Belgium this is Serge's website covering old technology and in particular vintage electronic calculators. The site includes - Desktop, pocket and special calculators, Pocket computers, Educational calculators, Catalog of Electronic Calculators (11.000+ references), Statistics about Calculators, TimeKeepers, Components used in Calculators, Advertisements / Publications / Brochures.
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- Vintage Calculators - www.vintagecalculators.com - A celebration of old calculators showing the evolution from mechanical calculator to pocket electronic calculator. Featuring - Mechanical & early electronic desk calculators, Strange hand-held calculators, Articles photographs and databases from the archives of the International Association of Calculator Collectors, Information and photographs for those interested in the history of technology, British and sterling currency calculators.
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- Vintage Calculator forums - www.xnumber.com/vintage_forum2 - The forums for all things in vintage calculators, electronic and mechanical.
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