C.3 assembly language samples, C.3.1 enable the dio input function, C.3.2 enable the dio output function – IEI Integration PCISA-9652 v1.01 User Manual
Page 209: C.3 a, Ssembly, Anguage, Amples
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PCISA -9652 Half-Size CPU Card
Page 189
C.3 Assembly Language Samples
C.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
Sets the digital port as input
INT
15H
Initiates the INT 15H BIOS call
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
Sets the digital port as output
MOV BL,
09H
INT
15H
Initiates the INT 15H BIOS call
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