Computers
- 41
- 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.
- 42
- Museum of Pocket Calculating Devices
- A gallery containing many varieties of pocket calculators, slide rules, and abacuses.
- 43
- Old HP and TI Calculators
- Photographs and information about HP and TI calculators, including many programs.
- 44
- Texas Instruments 59
- All about the TI-59 programmable calculator, with photographs and information about accessories, documentation and programs.
- 45
- 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.
- 46
- Vintage Calculators
- A celebration of old calculators showing the evolution from mechanical calculator to hand held electronic calculator.
- 47
- Vintage Calculators
- Information and lists of vintage and classic calculators, primarily Hewlett-Packard and Texas Instruments.