STOSD             Store String Doubleword (386)      Flags: O D I T S Z A P C

STOSD

           Logic:        DWORD PTR (ES:DI) . EAX
                         if DF = 0
                             DI . DI + 4
                         else
                             DI . DI - 4

     STOSD stores a doubleword from the EAX register into the memory location
     pointed to by ES:DI. DI is then incremented if the direction flag is
     cleared or decremented if it is set.

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   Operands                   Clocks   Transfers  Bytes  Example
   STOSD                      5 (386)      4        1    STOSD
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        Note:          These instructions are usually used with a REP
                       prefix. Load CX with the number of times to repeat
                       the instruction. You can only use STOSD on the 386.