NAME
   ReadUnitID - reread and return the type of drive (V37)

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

    ULONG ReadUnitID(LONG);

FUNCTION
    Rereads the drive id for a specific unit (for handling drives
    that change ID according to what sort of disk is in them.  You
    MUST have done a GetUnit before calling this function!

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
    GetUnitID

BUGS