Tom's Hardware Guide Computer hardware reviews and tips.
Old Computers Obsolete Technology
Vintage Computers Erik Klein's Vintage Computer Collection
Series 80 HP Series 80 Computers
HP 85 Gummy Wheel Problem Repair HP 85 tape transport wheel

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ASCII Table Table of ASCII codes.
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HP Museum The Museum of HP Calculators displays and describes Hewlett-Packard calculators introduced from 1968 to 1986 plus a few interesting later models. There are also sections on calculating machines and slide rules as well as sections for buying and selling HP calculators, an HP timeline, collecting information and a software library.
HP41 A site dedicated to documenting and preserving the amazing HP41 Calculator. Includes a great Windows software emulator of the HP41.
Calculator Museum Handheld, Desktops, and Pocket Computers
RSKey Programmable Calculators

Slide Rule
Eric's Slide Rule Site A site containing scans and descriptions of slide rules along with useful background information.
Slide Rule Universe All kinds of information about slide rules including lessons, maker's archives, links and an on-line marketplace and auction.
Oughtred Society A site dedicated to the history and collection of slide rules. Named for the founder of the modern slide rule - William Oughtred