*[https://www.atarimania.com/ Atari Mania] Games database of everything Atari
*{{EnWiki}}
===8-bit===
*https://atariwiki.org Atari 8bit wiki
*[[Media:Altirra Hardware Reference Manual - 20240921.pdf|Altirra Hardware Reference Manual]] Latest (09/2024!) Atari XL hardware documentation
=== 16-bit===
*https://www.atari-wiki.com Atari ST Wiki
*[[Media:Atari ST - Hardware Specification.pdf]]