IIRC it's because it's model designation was CX2600. They didn't use the 2600 designation originally (they called it the Atari VGS or something like that).I thi

IIRC it's because it's model designation was CX2600. They didn't use the 2600 designation originally (they called it the Atari VGS or something like that).I think they started using it because like Pong, they planned to release various versions of the system. Whether the model number was a reference to that is hard to say. It's not like they have much to do with eachother, and Atari had been naming their products with C---- model numbers for years...but it's conceivable that someone said "let's make it model 2600" with 2600hz in mind.