SCAS - Scan String  (Byte, Word or Doubleword)

        Usage:  SCAS    string
                SCASB
                SCASW
                SCASD   (386+)
        Modifies flags: AF CF OF PF SF ZF

        Compares value at ES:DI (even if operand is specified) from the
        accumulator and sets the flags similar to a subtraction.  DI is
        incremented/decremented based on the instruction format (or
        operand size) and the state of the Direction Flag.  Use with REP
        prefixes.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        string            15    7     7     6             1  (W88=19)


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