My favourite games supported by this computer probably would have been Rescue on Fractalus, Ballblazer, Preppie, Karateka, and Star Raiders II.
Sean and I retired almost all of our Atari hardware a couple of years ago to help create more space at Mom and Dad's place. I rescued this manual, among other Atari detritus. I was going to recycle it, but Sean will take the materials into his care instead. They're certainly fascinating artifacts of a lost era.