NAME
   GetUnitID - find out what type of disk is out there

SYNOPSIS
   idtype = GetUnitID( unitNum ), DRResource
    D0                  D0         A6

    LONG GetUnitID(LONG);

FUNCTION
    Gets the drive ID for a given unit.  Note that this value may
    change if someone calls ReadUnitID, and the drive id changes.

INPUTS
    unitNum -- a legal unit number (zero through three)

RESULTS
    idtype -- the type of the disk drive.  Standard types are
            defined in the resource include file.

EXCEPTIONS

SEE ALSO
    ReadUnitID

BUGS

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