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

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

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

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

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

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

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.

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

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

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