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I wasn't a SNES owner in the time, what is the special thing about the 1 chip and how do you determine? Serial #?

 

Serial number is one way to determine if it's a 1CHIP unit or not, but not guaranteed. It's stated that all 1 chip models have a "3" for the first numerical digit of its serial number, but not every unit that starts with a "3" is a 1CHIP variant.

But to be 100% sure, just simply remove the top cover (4.5mm Nintendo specific screw) and the motherboard will literally say 1CHIP on it.

Nintendo combined both video chips into one; all 1CHIP models are equally sought after. A non-1CHIP model will state CPU APU and the revision number; that's the model you don't want.

 

Good stuff!

 

Bump

Can pair with the Gameboy lot found here -

https://www.tacomaworld.com/threads/gameboy-lot.761807/