http://www.atari-history.com/ | The Atari Historical Society. A site with _very_ extensive info. |
http://atarihq.com/danb/78tech.htm | Dan Boris' Atari 7800 technical details |
http://atarihq.com/danb/ | Dan Boris' Atari (and general emulation) pages |
http://crash.ihug.co.nz/~aaronat/atari.html | Holmes Atari 400/800/XL/XE game archive |