How to Read Capacitor Codes
Diagram and explanations

How to Read Resistor Codes
Learn how to tell tolerance band, from multiplier, etc.

Pinouts
almost a 1000 of various cable and connector pinouts

Hardwarebook
Internet's largest free collection of connector pinouts and cable descriptions.

The Circuits Archive
Connectors, pinouts, codes and other info

pin-outs.com
Cables, Pinouts and Connectors

GamesX
Pinouts to videogames

The Technician's Guide to PC Hard Disk Subsystems
by Nicholas Majors of Data Recovery Labs is an excellent piece of work. Originally geared toward tech support personnel, but of much wider interest, it discusses history, principles, installation and configuration in a lucid no-nonsense style. Includes glossary and references.

The Archive of video terminal information
Character-cell video-display terminals, serial-line remote-graphics terminals, and software that emulates them.

Chip Directory
Pinouts to Integrated Circuits, etc

Tomi Engdahl's Electronics Pages
Useful electronics information collections

PC Hardware Link Page
Various Links and some own PC Hardware info

Electronics basics
Teaches how to build electronics

Networking Cabling Pinouts

BIOS Tone POST Codes

PC And PS2 POST ERROR CODES

Standard PC storage devices and I/O connector pinouts.

Standard PC Cabling Pin-out Diagrams

PCB Design
PCB (printed circuit board) design and assembly: free software, layout guidelines, trace calculators, tutorials, standards, tips, free cad program downloads. Includes manufacturing and prototyping guides and other info and resources.

Sci.Electronics.Repair FAQ
Represents a unique resource in the Universe providing information on a variety of topics including consumer electronics repair, general electronics, and lasers and optics.

Electronic circuits
Electronic circuits, kits, do-it-yourself, circuit diagrams, design and electronics hobby schematics

alt.comp.hardware.homebuilt
Frequently asked questions (FAQ) and general information pertaining to the newsgroup alt.comp.hardware.homebuilt

Total hardware - jumper settings
Jumper settings for about 20,000 devices

Circuit Sage
A complete source of information to help you design great circuits fast

Electronics Engineering - Knowledge Bases
A collection of links to electronic components, circuits, cables, etc.