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X-Hacker.org- Programmers Reference 0.02b - <b>0:504h phantom drive flag</b> http://www.X-Hacker.org [<<Previous Entry] [^^Up^^] [Next Entry>>] [Menu] [About The Guide]
0:504h                   Phantom drive flag

 Length: 1 byte

    Reports the status of a single-drive system when mimicking a two-drive
    system.

  --------------------------------------------------------------------------

    Examination of this byte will reveal the current status of the single
    drive installed on a one drive system. By using this byte, a
    programmer can avoid the message 'Insert disk for drive B:' when
    working with a single-drive system.

                  Value              Meaning
                   00h           Acting as drive A
                   01h           Acting as drive B
                   FFh           Acting as drive A

    Although the last value, FFh, is undocumented, FFh means the drive
    letter has not been determined yet, so using the drive as drive A will
    work correctly.

    To determine if only one drive is installed, use the equipment list
    (see INT 11h).

See Also: INT 11h

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