I can't recall where I got this pic from, but it has been massively helpful when trying to find where stuff actually is vs the schematics and BOM listings. I wish I had these for the 5200 and other consoles as well.
That would be me. I was in the process of converting it to a cleaner motherboard silkscreen image and making a second one for the other motherboard rev. Never got around to finishing it.
There should be similar motherboard silkscreens in the 2600 and 5200 service manuals.
Somewhat related, I don't think I ever posted a link to this one. http://www.atari7800...xplodedview.jpg