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. Vintage Calculators - A celebration of old calculators showing the evolution from mechanical calculator to hand held electronic calculator. Museum of Pocket Calculating Devices - A gallery containing many varieties of pocket calculators, slide rules, and abacuses. Calculator Technical Information - Technical information about many calculators, including chip pinouts and self-test sequences, and patent information. Be Calc - Serge Devidts' collection of vintage electronic calculators and some other pieces of old technology. Programmable Calculators - A collection of programmable and non-programmable calculators and accessories, with articles and repair notes. 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. Gregory Escov's homepage - Some articles about Russian made calculators, including undocumented features and error conditions. 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. Yahoo! Groups : oldcalcs - Bulletin board for collectors of old electronic calculators. Soviet Calculators Collection - Pictures of calculators from the former USSR. Includes advertisements, articles, and a guestbook. English and Russian languages. Vintage Calculators - Information and lists of vintage and classic calculators, primarily Hewlett-Packard and Texas Instruments. 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. 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. The Old Calculator Web Museum - Photographs of the exterior and interior of many vintage mechanical and electronic calculators. Also includes vintage advertisements and technical literature. Calculator's Pages - A collection of early mechanical calculating machines and other calculating devices. Rick Furr's Calculator Reference Page - A collection of information about HP, TI and Curta calculators. Includes articles and many related links. Old HP and TI Calculators - Photographs and information about HP and TI calculators, including many programs. Texas Instruments 59 - All about the TI-59 programmable calculator, with photographs and information about accessories, documentation and programs. Bring Back the HP 15C - Fans of the 15C want Hewlett-Packard to put it back in production. Find a list of reasons to bring it back, the reason it was discontinued in the first place, and an online petition. HP Collection - Matthias Wehrli's collection of HP calculators and accessories. Includes photographs and specifications for items in the collection. Electronic Calculator History and Technology Museum - Preserving the history of electronic calculators with information and photographs of early desktop and pocket calculators. Illustrated Calculating Machines by Ernst Martin - English translation of the most important book on calculating machines "Rechenmaschinen" by Ernst Martin is illustrated on this site. Includes .pdf version of the book, pictures of the machines, production years, and articles. Calculator Collecting - Webring designed to allow navigation between similar sites dealing with the hobby of collecting, and history of electronic calculators.