D.3.2 enable the dio output function – IEI Integration IMB-Q870-i2 User Manual

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IMB-Q870-i2 microATX Motherboard

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D.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

Sets the digital port as output

MOV BL,

09H

INT 15H Initiates the INT 15H BIOS call