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STD              Set Direction Flag                  Flags: O D I T S Z A P C
                                                              1
          Logic:    DF . 1           (Decrement in string instructions)

    STD sets the Direction Flag. No other flags are affected. Setting the
    direction flag causes string operations to decrement SI and DI.

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   Operands                  Clocks   Transfers  Bytes   Example
   no operands                 2          -        1     STD
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