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    Predefined device types that may use Device Post are:
    00H  disk (may time-out)
    01H  floppy disk (may time-out)
    02H  keyboard (no time-out)
    03H  pointing device (PS/2, may time-out)
    80H  network (no time-out)
 
    The ROM BIOS printer routine does not invoke this function because
    printer output is not interrupt driven.
 
    A multitasking program manager would be expected to capture Int 15H
    Function 91H so that it can be notified when I/O is completed and awaken
    the requesting task. The default BIOS routine for this function simply
    returns with the carry flag clear and AH=00H.
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