GNU Info

(nasm.info)Section B.4.119

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B.4.119. `IN': Input from I/O Port
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     IN AL,imm8                    ; E4 ib                [8086]
     IN AX,imm8                    ; o16 E5 ib            [8086]
     IN EAX,imm8                   ; o32 E5 ib            [386]
     IN AL,DX                      ; EC                   [8086]
     IN AX,DX                      ; o16 ED               [8086]
     IN EAX,DX                     ; o32 ED               [386]

   `IN' reads a byte, word or doubleword from the specified I/O port,
and stores it in the given destination register. 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 `OUT' (*Note Section
B.4.194::).


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