MOVS - Move String (Byte or Word)

        Usage:  MOVS    dest,src
                MOVSD  (386+)
        Modifies flags: None

        Copies data from addressed by DS:SI (even if operands are given) to
        the location ES:DI destination and updates SI and DI based on the
        size of the operand or instruction used.  SI and DI are incremented
        when the Direction Flag is cleared and decremented when the Direction
        Flag is Set.  Use with REP prefixes.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        dest,src          18    5     7     7             1   (W88=26)

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