TinyELF
A freeware emulator of CDP1802 based microcomputers for Mac OS X.
http://homepage.mac.com/ruske/tinyelf/

Troubleshooting MicroComputers
Experts on PC and Mac repair
http://www.troubleshooters.com/tmicro.htm

The Computer Closet
The Computer Closet rescues classic microcomputers and video games from the junk heap to preserve our technological legacy.
http://www.computercloset.org/

Chronology of Personal Computers
Chronology of Personal Computers: timeline of events tracing the history of personal computers, from the late 1960s to date.
http://www.islandnet.com/~kpolsson/comphist/

Computek Consultancy
Design consultancy for products using embedded microcontrollers or PCs. Located in South Wales, UK.
http://www.computekconsultancy.co.uk

Mind Machine Museum
Web museum of vintage computers, calculators, video games, and artifacts
http://userwww.sfsu.edu/~hl/mmm.html

NBASIC
NBASIC is a classic BASIC interpreter that provides an environment similar in operation to microcomputers of the early 1980's.
http://sylvaware.home.mindspring.com

Luxor ABC 800 serie
The index to the site that maintains the archive for the technical data and history of Luxor ABC800 microcomputers.
http://www.devili.iki.fi/Computers/Luxor/

Microcomputer Operating Systems
Some 70 OSs that run on microcomputers, PCs. User interfaces in earlier systems are command-line, character-oriented; later systems are mostly GUI-based. List, with brief descriptions, no links. From West Virginia University.
http://www.csee.wvu.edu/~jdm/classes/cs258/OScat/micros.html

Software Spectrum, Inc.
Resells business software for microcomputers and offers business software technical services. (Nasdaq: SSPE).
http://www.swspectrum.com/