"Microsoft" Flight Simulator on the PC was actually a version of Sublogic's Flight Simulator for the Apple ][ (although it gets complicated because the classic setting of Chicago's Meigs Field was on the PC first and then backported to the Apple ][ version). But if you were impressed that the flight simulator ran on a 4.77 Mhz PC, how much more amazing that it ran on a 1 Mhz Apple ][?