PCH 7991
19 inch Atom Fanless Panel PC
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All rights reserved. Product description and product specifications
are subject to change without notice. For latest product information,
please visit Acnodes’ web site at www.acnodes.com.
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Exam p le x86 assem bly code:
m ov dx, 4E h
m ov al, 87h
out dx, al
out dx, al
Exam p le C code:
outportb(0x4E, 0x87);
outportb(0x4E, 0x87);
Exit the extended function
mode
W riting A A h to index address port wi ll exit the ext ended function m ode.
Exam p le x86 assem bly code:
m ov dx, 4E h m ov al,
0A Ah out dx, al
Exam p le C code:
outportb(0x4E, 0xA A );
Selec t logic device number
Exam p le x86 assem bly code:
;LDN s election regist er
;Sel ect LDN =8, GP IO Po rt6
out dx, al
;or S elect LD N9, GP IO Port2
Exam p le C code:
outportb(0x4E, 0x07); //LDN s election register
outport b(0x4F, 0x08); // Selec t LDN= 8, GP IO Port6 or
outportb(0x4E, 0x07); //LDN selecti on regis ter
outportb(0x4 F, 0x09); //Sel ect LDN= 9, GP IO P ort2
