AM/BIOS POST Checkpoint Codes
POST is performed by the BIOS when the system is reset or
rebooted. POST performs diagnostics tests on system parts and
initialized key system components. When a POST routine com
pletes, a code is written to 1/0 port address SOh. Display this
code by attach ing diagnostic equipment to port SOh.
The fol lowing POST checkpoint codes are valid for 4 3 3
mainboard's WinBIOS.
Codes
Description
0
I
h
Processor register test starting and NMI will be disabled.
02h
NMI is Disabled. Power on delay starting.
03h
Power on delay complete. Checking soft reset and power-on next.
05h
Soft reset and power determined. Enabling ROM next and disabling
shadow RAM and cache memory, if any.
06h
ROM is enabled. Calculating ROM BIOS checksum.
07h
ROM BIOS checksum passed. CMOS shutdown register test to be done
next.
08h
CMOS shutdown register test done. CMOS checksum calculation to be
done next.
09h
The CMOS checksum calculation is done and the CMOS RAM
Diagnostic byte has been written. CMOS RAM initialization is next if the
Initialized CMOS At Every Boot
option is set.
OAh
CMOS RAM is initialized. The CMOS RAM status register will be
initialized for Date and Time next.
OBh
The CMOS RAM status register has been initialized. Any initialization
before the keyboard BAT test will be done next.
OCh
The keyboard controller
VB
is free. Issuing the BAT command to the
keyboard controller next.
ODh
The BAT command wa� issued to the keyboard controller. VerifYing the
BAT command next.
OEh
The keyboard controller BAT result has been verified. Any initialization
after the keybaord controller BAT command will be done next.
User's Manual 57
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