Yeah, that's right it ran those other games. But the name Atari 400/800 doesn't sound familiar for some reason. Maybe there was another name for it at the time. I was 9 at the time, so I don't remember exactly. I do remember playing Bug Hunt, Dig Dug, Missile Command (built in), Arkon, Lode Runner. I was never able land in Flight Simulator II. I should go find an emulator and try now.
They were beautiful machines. I was a Commodore user at the time and had no idea what I was missing, but I own a bunch of Atari 8-bits now. Emulators are great, but you should hunt yourself down an original Atari 8-bit to collect.