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0040h:0090h           Diskette Drive 0 Media State

    Length: 1 byte

    This byte is reserved for the PC, PCjr, PC XT dated 11/8/82, and
    the PC Convertible. For all others, this byte contains the state
    of the floppy diskette drive 0.

        Diskette Drive Media State

        7 6 5 4 3 2 1 0
        x x . . . . . .      Diskette Drive Data Rate (See below)
        . . x . . . . .      Double Stepping Needed
        . . . x . . . .      Media known
        . . . . x . . .      Reserved
        . . . . . x x x      Media/Drive Types (See below)


        Diskette Drive Data Rate (Bits 7 and 6)

        00      500K per second
        01      300K per second
        10      250K per second
        11      Reserved


        Media/Drive Types (Bits 2, 1, and 0)

        000     360K/360K not established
        001     360K/1.2M not established
        010     1.2M/1.2M not established
        011     360K/360K established
        100     360K/1.2M established
        101     1.2M/1.2M established
        110     Reserved
        111     None of the above