A collection of Sumlock Anita calculators and simulators, and related devices associated with the Sumlock factory in Portsmouth, U.K., in the 60s and 70s.

Serge Devidts' collection of vintage electronic calculators and some other pieces of old technology.

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.

The private collection of the Dutch collector Nico Baaijens of mechanical, electro-mechanical and electronic counting, adding and calculating machines. Many pictures and close-ups.

Webring designed to allow navigation between similar sites dealing with the hobby of collecting, and history of electronic calculators.

Technical information about many calculators, including chip pinouts and self-test sequences, and patent information.

A collection of early mechanical calculating machines and other calculating devices.

A software simulator of Soviet calculators like B3-34, MK-61, MK-52 and others. Program is available for Windows OS.

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.

Calculators from the '70s, and famous home and personal computers from '80s. Photos, historic information and links to other resources.

Links to useful sites about the Curta. Also documents the full disassembly of one, with pictures.

An overview of the calculators manufactured by Texas Instruments Inc. from the famous Datamath (1972) to the modern Graphics calculators, with history and articles.

A source of information about the technology used in the construction of early electronic calculators. Includes a reverse-engineering project.

Preserving the history of electronic calculators with information and photographs of early desktop and pocket calculators.

Some articles about Russian made calculators, including undocumented features and error conditions.

A guide by Larry Gilbert.

Matthias Wehrli's collection of HP calculators and accessories. Includes photographs and specifications for items in the collection.

A library of information about the HP-41 series calculators, with emulators, publications, FAQ, and related links.

English translation of the most important book on calculating machines "Rechenmaschinen" by Ernst Martin is illustrated on this site. The site includes .pdf version of the book, many interesting pictures of the machines, production years, and articles.

Mechanical calculating machines from a collector's point of view, with articles and links to relevant sites.

A gallery containing many varieties of pocket calculators, slide rules, and abacuses.

Displays handheld and desktop calculators from the 1900s to the present, showing interesting features of each.

Photographs and information about HP and TI calculators, including many programs.

A collection of programmable and non-programmable calculators and accessories, with articles and repair notes.

Photographs of some older calculator models.

A wealth of information about the HP-75C.

A collection of information about HP, TI and Curta calculators. Includes articles and many related links.

Pictures of calculators from the former USSR. Includes advertisements, articles, and a guestbook. English and Russian languages.

Article about the history of the development of Soviet calculators, the features and interesting characteristics of the most relevant models are described.

An A-Z index of manufacturers, with product photographs, and a timeline of model releases.

All about the TI-59 programmable calculator, with photographs and information about accessories, documentation and programs.

Pictures and descriptions of The Castell Addiator and The Rapid-Calcolo.

Information about every HP calculator made since 1968. Includes photo gallery, old advertisements, operating instructions, pricing information and discussion forum.

Photographs of the exterior and interior of many vintage mechanical and electronic calculators. Also includes vintage advertisements and technical literature.

Virtual museum of vintage mechanical and electronic desktop calculators from the late 1950s through the late 1970s

A collection of articles about the history of calculators, mechanical and electronic. Also, a number of on-line calculators, recommended books, and a vintage collectors forum.

Information about various HP calculator models, with photographs. Includes instructions on using some of the special functions of some models.

A celebration of old calculators showing the evolution from mechanical calculator to hand held electronic calculator.

A collector displays his small collection of old calculator models.

Information and lists of vintage and classic calculators, primarily Hewlett-Packard and Texas Instruments.

Bulletin board for collectors of old electronic calculators.