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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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