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_based                  Specified Based Segment

    This keyword indicates that a data object of some type exists in the
    segment specified; for example, _based(cbase) cdata declares
    cdata to reside in the segment cbase. Pointers that are defined
    as base pointers are only 16 bits long since they are used as offset
    pointers only; they are added to the base to form the full 32-bit
    address.

    Note: use _segment or _segname for based segment definitions.