REPE/REPZ - Repeat Equal / Repeat Zero

        Usage:  REPE
                REPZ
        Modifies flags: None

        Repeats execution of string instructions while CX != 0 and the Zero
        Flag is set.  CX is decremented and the Zero Flag tested after
        each string operation.   The combination of a repeat prefix and a
        segment override on processors other than the 386 may result in
        errors if an interrupt occurs before CX=0.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              2     2     2                   1


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