Just finished a massive document upgrade to the technical section, so large, I split the technical archive listings into two seperate pages.
Documents Archive - A collection of technical articles written by some of the best pinball people on the internet, as well as general hints, official announcements, and general newsgroup stuff.
Files Archive - The companion to the manual archive, the files archive contains pdf versions of technical manuals released by the companies themselves. There's such information as parts catalogs, mpu info, general technical guides, and schematics.
The technical archive main is http://www.hippie.net/shivasite/pinball/technical.shtml