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Nestopia is a very accurate NES emulator for Mac OS X. With the exception of Game Genie emulation, it does not feature any extraneous features like a debugger or advanced palette features and just focuses on accuracy.
nestopia-141.dmg (2.24 MiB / 2.35 MB)
28 / 2017-10-04 / 542fd93d9291c8058ab34f0249dd4f62538ecd5f
Mac OS X PPC or Intel.
Best suited for an 800mHz G4 or faster, but works on a 450 MHz G4.
Emulating this? It should run fine under: QEMU