USB Adapter for Original Controllers

I want to get an original sega genesis 6 button controller and use it for retroarch that I run on my mac. Is there a good, reliable USB adapter that anyone can recommend for the originals? Thanks.

I use the Mayflash ones with my original Sega Saturn controllers on my Win10 PC and I think they’re great, here is the link to MegaDrive / Genesis ones; note that it does not mention Mac compatibility explicitly but they’re USB plug-and-play on Windows, so might work anyway…you might want to do some digging on this before buying however.