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F2 ULV-CPU
54
POST
Code
(Hex)
Name
Description
A4h
KEY_RATE
Initialize keyboard typematic rate.
AAh
SCAN_FOR_F2
IF <2 key was pressed during POST> THEN
Set flag indicating key press.
Display “Entering Setup” message.
ENDIF
ACh
SETUP_CHECK
IF <2 was pressed> THEN
Enter Setup.
ELSE IF <errors were found> THEN
Display “Press 7 or 2” prompt.
IF <2 is pressed> THEN
Enter Setup.
ELSE IF <7 is pressed> THEN
Boot.
ENDIF
ELSE
Boot.
ENDIF
AEh
CLEAR_BOOT
Clear CMOS bit indicating POST is in progress.
B0h
ERROR_CHECK
IF <error were found> THEN
Beep twice.
Display “Press 7 or 2” message.
IF <2 is pressed> THEN
Enter Setup.
ELSE IF <7 is pressed> THEN
Boot.
ENDIF
ENDIF
B2h
POST_DONE
Change BIOS data areas flag to indicate POST is
complete.
B4h
ONE_BEEP
Beep once.
B5h
QUIETBOOT_END
Reset video:
Clear screen, reset cursor, reload DAC.
B6h
PASSWORD
IF <password enabled> THEN
Print message requesting password.
IF <password incorrect> THEN
Halt.
ENDIF
ENDIF
B8h
SYSTEM_INIT
Clear the GDT.
B9h
PREPARE_BOOT
Prepare to boot, clear the screen.
BAh
DMI
Initialize DMI header and substructures.
C0h
INT19
Do INT 19h to load OS.
Additional Test points codes
These test points are only available if the memory has some malfunction.
POST Code [Hex]
Description
E0h
Unsupported RAM detected / No RAM installed
E1h – EFh
RAM specification not valid