I had an Atari 400 (McDonald's Cash register keyboard, no keys) with a cassette drive.
Used to play Avalon Hill's "B-1 Nuclear Bomber" with it. No graphics, just text messages....
I had Hammurabi. No graphics either. You entered in how much food you'd distribute, how much you'd save, etc. Depending on how you answered, your population would either grow or starve out.