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(nasm.info)Section B.4.194

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B.4.194. `OUT': Output Data to I/O Port
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     OUT imm8,AL                   ; E6 ib                [8086]
     OUT imm8,AX                   ; o16 E7 ib            [8086]
     OUT imm8,EAX                  ; o32 E7 ib            [386]
     OUT DX,AL                     ; EE                   [8086]
     OUT DX,AX                     ; o16 EF               [8086]
     OUT DX,EAX                    ; o32 EF               [386]

   `OUT' writes the contents of the given source register to the
specified I/O port. The port number may be specified as an immediate
value if it is between 0 and 255, and otherwise must be stored in `DX'.
See also `IN' (*Note Section B.4.119::).