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170 Maintaining and Troubleshooting the Gateway ALR 9200 Server
Error and Informational Messages
When you turn on the system, POST displays messages that provide
information about the system. If a failure occurs, POST emits beep codes
that indicate errors in hardware, software, or firmware. If POST can display
a message on the video display screen, it causes the speaker to beep twice as
the message appears.
POST Codes and Countdown Codes
The BIOS indicates the current testing phase during POST after the video
adapter has been successfully initialized by outputting a 2-digit hex code to
I/O location 80h. If a port-80h ISA POST board is installed, it displays the
2-digit code on a pair of hex display LEDs. Hex codes and their meanings
are listed in Table 34.
Table 34: Port-80h Codes and Beep Codes
Port-80
Codes
Beep
Codes
Error Descriptions
02 Verify Real Mode
04 Get processor type
06 Initialize system hardware
08 Initialize chipset registers with initial POST values
09 Set in POST flag
0A Initialize processor registers
0B Enable processor cache
0C Initialize caches to initial POST values
0E Initialize I/O
0F Initialize the local bus IDE
10 Initialize Power Management
11 Load alternate registers with initial POST values new
12 Restore processor control word during warm boot
14 Initialize keyboard controller
16 1-2-2-3 BIOS ROM checksum
18 8254 timer initialization
1A 8237 DMA controller initialization
1C Reset Programmable Interrupt Controller
20 1-3-1-1 Test DRAM refresh
22 1-3-1-3 Test 8742 Keyboard Controller
24 Set ES segment register to 4GB
28 1-3-3-1 Autosize DRAM
2A Clear 512K base RAM
3424.boo Page 170 Wednesday, September 2, 1998 9:23 AM