| Opcode | Instruction | Op/En | 64-Bit Mode | Compat/Leg Mode | Description | | ------ | ------------- | ----- | ----------- | --------------- | --------------------------------------------------- | | E6 ib | OUT imm8, AL | I | Valid | Valid | Output byte in AL to I/O port address imm8. | | E7 ib | OUT imm8, AX | I | Valid | Valid | Output word in AX to I/O port address imm8. | | E7 ib | OUT imm8, EAX | I | Valid | Valid | Output doubleword in EAX to I/O port address imm8. | | EE | OUT DX, AL | ZO | Valid | Valid | Output byte in AL to I/O port address in DX. | | EF | OUT DX, AX | ZO | Valid | Valid | Output word in AX to I/O port address in DX. | | EF | OUT DX, EAX | ZO | Valid | Valid | Output doubleword in EAX to I/O port address in DX. |