This is a timely article for me. I was consulting Joe Decuir's Engineering Notebooks just yesterday and wondered if these sorts of notebooks were a common thing or whether it was just Atari.

Joe Decuir was an engineer at Atari and was involved with the development of the 2600. His notebooks can be useful references for the 2600, even to this day.

https://archive.org/details/JoeDecuirEngineeringNotebook1977

https://archive.org/details/JoeDecuirEngineeringNotebook1978