By the time the legendary Atari VCS 2600 console was finally killed by Atari, its legacy continued on with plenty of clones from China, with built-in games up until the mid-90's or so.
They are marketed under many different names throughout the world, but the manufacturers all used the same All-In-A-VCS CPU chip, the 6591 mostly.
The built-in games were pretty limited, for the most part, variations of the same games, in different looks-difficulty-colors-feels and levels.
6591 CPU pin-out, IC info and more:
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6591 CPU drawing and schematic for basic functions:
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