STOS - Store String  (Byte, Word or Doubleword)

        Usage:  STOS    dest
                STOSB
                STOSW
                STOSD
        Modifies flags: None

        Stores value in accumulator to location at ES:(E)DI (even if operand
        is given).  (E)DI is incremented/decremented based on the size of
        the operand (or instruction format) and the state of the Direction
        Flag.   Use with REP prefixes.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        dest              11    3     4     5             1  (W88=15)


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