Assembly Language Samples; Enable The Dio Input Function; Enable The Dio Output Function - IEI Technology KINO-PVN-D5251 User Manual

KINO-PVN-D5251/D4251/ Mini ITX SBC
D.3 Assembly Language Samples
D.3.1 Enable the DIO Input Function
The BIOS interrupt call INT 15H controls the digital I/O. An assembly program to enable
digital I/O input functions is listed below.
MOV AX, 6F08H
INT 15H
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
MOV BL, 09H
INT 15H
Sets the digital port as input
Initiates the INT 15H BIOS call
Sets the digital port as output
Initiates the INT 15H BIOS call
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