1-4 POST Errors / Beep Codes
1 Specifications
1-5
Sens Q 20
Meaning
Verify Real Mode
Get CPU type
Initialize system hardware
Initialize chipset registers with initial POST values
Set in POST flag
Initialize CPU registers
Initialize cache to initial POST values
Initialize I/O
Initialize the local bus IDE
Initialize Power Management
Load alternate registers with initial POST values
Restore CR0 after CPU is reset
Initialize keyboard controller
BIOS ROM checksum
8254 timer initialization
8237 DMA controller initialization
Reset Programmable Interrupt Controller
Test DRAM refresh
Test 8742 Keyboard Controller
Set ES segment register to 4 GB
Autosize DRAM
Clear 512K base RAM
Test 512K base address lines
Test 512K base memory
Test CPU bus-clock frequency
Test CMOS RAM
Initialize alternate chipset registers
Reinitialize the chipset(MB only)
Shadow system BIOS ROM
Reinitialize the cache (MB only)
Autosize cache
Configure advanced chipset registers
Load alternate registers with CMOS values
Set initial CPU speed
Initialize interrupt vectors
Initialize BIOS interrupts
Check ROM copyright notice
Check video configuration against CMOS
Initialize PCI bus and devices
Initialize all video adapters in system
Shadow video BIOS ROM
Display copyright notice
Display CPU type and speed
Initialize EISA board
Test keyboard
Set key click if enabled
Enable keyboard
Test for unexpected interrupts
Display prompt “Press F2 to enter SETUP”
Test RAM between 512 and 640K
Error Codes
02
04
06
08
09
0A
0C
0E
0F
10
11
12
14
16
18
1A
1C
20
22
24
28
2A
2C
2E
32
34
35
37
38
39
3A
3C
3D
40
42
44
46
48
49
4A
4C
4E
50
51
52
54
56
58
5A
5C
Beep Codes
1-1-1-3
1-1-2-1
1-1-2-3
1-1-3-1
1-1-3-2
1-1-3-3
1-1-4-1
1-1-4-3
1-1-4-4
1-2-1-1
1-2-1-2
1-2-1-3
1-2-2-1
1-2-2-3
1-2-3-1
1-2-3-3
1-2-4-1
1-3-1-1
1-3-1-3
1-3-2-1
1-3-3-1
1-3-3-3
1-3-4-1
1-3-4-3
1-4-1-3
1-4-2-1
1-4-2-2
1-4-2-4
1-4-3-1
1-4-3-2
1-4-3-3
1-4-4-1
1-4-4-2
2-1-1-1
2-1-1-3
2-1-2-1
2-1-2-3
2-1-3-1
2-1-3-2
2-1-3-3
2-1-4-1
2-1-4-3
2-2-1-1
2-2-1-2
2-2-1-3
2-2-2-1
2-2-2-3
2-2-3-1
2-2-3-3
2-2-4-1
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