Are there any published 2600/5200/7800 technical articles available?
Andy Clayton (aclayton@leland.Stanford.EDU) was kind enough to type up Design Case History: the Atari Video Computer System from the March 1983 IEEE Spectrum. It is quite an interesting read although it contains no code. IBM’s patent server also contains a wealth of information including many Atari patents. Grant LeTourneau’s (snapsnar@tezcat.com) web page contains on-line versions of Atari Field Service Manuals for the 2600 and 5200.