Port 80H Codes - Intel AC450NX Product Manual

AC450NX Rack Server System Product Guide

Port 80h Codes

After the video adapter has been successfully initialized after the server is turned on, the BIOS
indicates the current testing phase during POST by writing a 2-digit hex code to I/O location 80h.
If a port-80h card is installed, it displays this 2-digit code on a pair of hex display LEDs.
The following table contains the port-80h codes displayed during the boot process. The table also
describes the error conditions associated with each beep code and the corresponding POST
checkpoint (CP) code as seen by a port-80h card. A beep code is a series of individual beeps
emitted by the server speaker, each equal in length. For example, if an error occurs at checkpoint
20h, a beep code of 1-3-1-1 is generated (1 = a single beep, 3 = burst of three beeps).
CP Beeps
02
04
06
08
09
0A
0B
0C
0E
0F
10
11
12
14
16 1-2-2-3
18
1A
1C
20 1-3-1-1
22 1-3-1-3
24
28 1-3-3-1
2A
2C 1-3-4-1
2E 1-3-4-3
30 1-4-1-1
32
34
35
36
270
Reason
Verify real mode
Get processor type
Initialize system hardware
Initialize chip set registers with initial POST values
Set in-POST flag
Initialize processor registers
Enable processor cache
Initialize caches to initial POST values
Initialize I/O
Initialize the local bus IDE
Initialize Power Management
Load alternate registers with initial new POST values
Restore processor control word during warm boot
Initialize keyboard controller
BIOS ROM checksum
Initialize 8254 timer
Initialize 8237 DMA controller
Reset Programmable Interrupt Controller
Test DRAM refresh
Test 8742 Keyboard Controller
Set ES segment register to 4 GB
Autosize DRAM
Clear 512K base RAM
RAM failure on address line xxxx*
RAM failure on data bits xxxx* of low byte of memory bus
RAM failure on data bits xxxx* of high byte of memory bus
Test processor bus-clock frequency
Test CMOS
RAM initialize alternate chip set registers
Warm start shutdown
continued