VERR - Verify Read (286+ protected)

        Usage:  VERR    src
        Modifies flags: ZF

        Verifies the specified segment selector is valid and is readable
        at the current privilege level.  If the segment is readable,
        the Zero Flag is set, otherwise it is cleared.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg16             -     14    10    11            3
        mem16             -     16    11    11            5


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