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

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

Amstrad CPC – CPC++ (maybe more)

http://www.bricerive.com/cpc/cpcpp.html (for 68k and ppc)