Emulators

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Snes

Zsnes

For dos (I think this one is better)

9xSnes

For windows (this works fine)

Nes

Nesticle

This is the only nes emulator that worked for me.

FWNEs

This works with all the Nes games

Gameboy

No$GBM

This is for Windows

Genesis

Gcyst

I've never used it, but I heard it works great