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curl-6 said:

Enhancement chips inside game cartridges that added extra capability; most famously the Super FX chip used to power SNES games like the original Starfox, Yoshi's Island, and Doom.

It was kinda cool back then how it allowed for games that would be impossible on the base hardware.

Having the save game on the cartridge was also helluva convenient.

Expansion slots in general. Now we have pro consoles, got to buy a whole new console for a bit of extra power.