*{{EnWiki}}
*https://wwwatariwiki.atari-org/wiki.com / Atari Wiki8bit wiki
*[[Media:Altirra Hardware Reference Manual - 20240921.pdf|Altirra Hardware Reference Manual]] Latest (09/2024!) Atari XL hardware documentation
*https://www.atari-wiki.com Atari ST Wiki
*[[Media:Atari ST - Hardware Specification.pdf]]
*[https://www.atarimuseum.de/archiv/tech/sm_ste.pdf Atari STE Service Manual]