Mac users interested in Nestopia emulator generally download:
Nestopia is a Nintendo Entertainment System (NES) emulator for the Mac. It allows you to play ROM files, which are dumps of NES games. You are legally allowed to play any ROM files of games that you own. The emulator doesn't require any configuration at all. You can just load a ROM and start playing.
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KiGB is a Game Boy and Super Game Boy emulator for the Mac.
for emulator compatibility ...Nestopia...for the Mac. Nestopia
Nestopia is the current king of the NES emulation hill.
inferior emulators. This accurate...come at a cost; Nestopia