Cartridge Pinout for LED Mod?

I was trying to think of an original idea for a console mod and decided to do something I hadn't seen before: LED display of the cartridge's reading. Basically it'd just be a bunch of LEDs in a line in front of the cart that would flash on/of "randomly" where their actually getting their

The problem I'm having is that I can't find a pinout for the cartridge reader! If you know which pins on the cartridges correspond to ground, could you share the information please? :D
 
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