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)