Whether these emulators support operating systems for these consoles is unknown; it must be looked into further. Consoles without meaningful OSes are not included.

Nintendo Entertainment System – NESMac

https://emulation.gametechwiki.com/index.php/NESMac

Nintendo Game Boy – GBMac

https://www.macintoshrepository.org/10592-gbmac http://hp.vector.co.jp/authors/VA009321/index2.html