I can remember running CP/M on an Apple II+ (I had a Z80A Co-Pro card and it flew, relatively speaking of course ;) )
Mmmmmmmmmm Z80A @ 2MHz! 8-)
Here's a photo of the model I had, mine had 4 FDDs!
You needed 2x FDD cards for that, what with the Z80A CoPro that was a major...