IEI Integration IMB-H612A - Manual (Page 190)

IMB-H612 Mic ro -ATX Mo th e rb o a rd
P a g e 175
D.3.2 En a b le th e DIO Ou tp u t Fu n c tio n
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