INT 65 U - Media Vision FM(Frequency Modulation)	A method of encoding data as a series of magnetic flux reversals on disk or tape, commonly known as single-density recording.  In frequency modulation, a series of clock pulses are written at regular intervals, with one data bit for each clock pulse.  See also MFM, RLL..COM v4.1a+ - GET ???
	SI = 8004h
Return: AX = ??? (0280h)
	DX = ??? (01A0h)