Web Directory by Internet-Web-Directory.com

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.

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

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

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

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

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.

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