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2600 cartridges can contain any amount of extra RAM or even CPU hardware.

But this pretty well isn't real. There's no way you could drive a workable Ethernet connection just from an RF output. Also the "screenshot" is completely fake, the 2600 has nowhere near enough video objects to output all of that.

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To be fair, the Atari 2600 supports sprite multiplexing.[0] And you can drive a BBC Micro's floppy drive from its screen output lines…[1]

[0]: https://en.wikipedia.org/wiki/Sprite_multiplexing

[1]: https://scarybeastsecurity.blogspot.com/2020/07/turning-400-...

Multiplexing on the 2600 can't go nearly as far as that screenshot shows. The 2600 has two sprites per line plus a few single-bit objects. There's a particular way to reuse sprites within the same scanline, but only at certain fixed intervals which isn't what we see here, plus strobing the positioning register that fast requires every single CPU cycle so it's impossible to also write the color and playfield registers at the same time.

Source: I know the 2600 well, I wrote and published a homebrew game: http://dos486.com/atari/

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