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B.3 Assembly Language Samples
B.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
B.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
CyberResearch
®
CPU Cards
CPCx Series
CyberResearch, Inc
.
1
87
25 Business Park Drive
P: (203) 483-8815; F: (203) 483-9024
Branford, CT USA
www.cyberresearch.com
Содержание CPGT C2-24-X Series
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Страница 246: ...CyberResearch Inc 25 Business Park Drive Branford CT 06405 USA P 203 483 8815 F 203 483 9024 www cyberresearch com...