That Time Atari Cracked the Nintendo Entertainment System
hackaday.com
hackaday.com
Yes, there was gaming on microcomputers, but it was about half the size of the console market. Between 10 and 17 million Commodore 64s were sold, compared with about 30 million Atari 2600s. (About 8 million of the other pre-NES consoles were made.) The NES went on to sell about 62 million units.
https://en.wikipedia.org/wiki/List_of_best-selling_game_cons...