Perhaps some of you wonder why SNES could display so good graphics despite having a relatively slow CPU. While some games used "tricks" to do this (like the pre-rendered graphics in Donkey Kong Country), the answer for the most part is in the special in-cart enhancement chips. Rather than giving the SNES a powerful but expensive CPU that would still become outdated, Nintendo opted to developed those special chips that would help each individual game at rendering the graphics. The best example of the usage of these chips has to be Star Fox as the game would be impossible on the SNES (or atleast severely downgraded) if it wasn't for the Super FX chip. Sega later copied this concept with their Virtua Racing for the Genesis and the SVP chip but that was mostly an exception. The in-cart chips became prominent and died with the SNES and later cartridge based systems didn't use them.
Here you can watch a great introduction to and explanation how these chips work:
http://www.youtube.com/watch?v=Q1UyQDqHBfA
And here is some more info:
http://en.wikipedia.org/wiki/List_of_Super_NES_enhancement_chips
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