Anyone know...
 

of a place were I can download some of the really great late 80 early 90 games? My friend has some of the Mega Man games somehow downloaded to his X-Box...but I was looking for maybe some Ninja Turtle or Donky Kong action.

If you mean ROMs,

www.dgemu.com (You've got to sign up)
www.rom-world.com


I don't know about XBox though.