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IMBA-9654 ATX Motherboard C.3.2 Enable the DIO Output Function The BIOS interrupt call INT 15H controls the digital I/O. An assembly program to enable digital I/O output functions is listed below. MOV AX, 6F09H MOV BL, 09H INT 15H Sets the digital port as output Initiates the INT 15H BIOS call Page 203