Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
OUT Instruction
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  Title:    Output to Port                        Flags: O D I T S Z A P C
                                                         ═════════════════
  Syntax:   OUT port,accumulator                              -none-
 
  See also: IN, OUTS, INS, ECHO Directive, MASM 5.1
Compatibility
 
  Description:
 
     Transfers a byte or word (or doubleword on the 80386/486) to a
     port from the accumulator register. The port address is specified
     by the destination operand, which can be DX or an 8-bit constant.
 
     In protected mode, a general-protection fault occurs if OUT is
     used when the current privilege level is greater than the value of
     the IOPL flag.
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