IEI Integration PCIE-Q870-i2 - Manual (Page 206)

PCIE-Q870-i2 PICMG 1.3 CPU Card
Page 189
MOV AX, 6F08H Sets the digital port as input
INT 15H Initiates the INT 15H BIOS call
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