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CLD              Clear Direction Flag                Flags: O D I T S Z A P C
                                                              0
CLD

          Logic:    DF . 0             (Increment in string instructions)

    CLD zeros the Direction Flag. No other flags are affected. Clearing
    the direction flag causes string operations to increment SI and DI.

  --------------------------------------------------------------------------
   Operands                  Clocks   Transfers  Bytes   Example
   no operands                 2          -        1     CLD
  --------------------------------------------------------------------------

       Note:          String instructions increment SI and DI when the
                      direction flag is clear.