Troubleshooting and Repair 4-15
Table Section 4-5 Diagnostic Output and Beep Codes
Code
Beeps
Description of Test or Failure at POST
08
initialize chipset registers with initial POST values
09
set in POST flag
0A
initialize CPU registers
0C
initialize cache to initial POST values
0E
initialize I/O
10
initialize power management
11
load alternate registers with initial POST values
12
jump to UserPatch0
14
initialize keyboard controller
16
2-2-3
BIOS ROM checksum
18
8254 timer initialization
1A
8237 DMA controller initialization
1C
reset programmable interrupt controller
20
3-1-1
test DRAM refresh
22
3-1-3
test 8742 keyboard controller
24
set ES segment register to 4 GB
28
autosize DRAM
2A
clear 512k base RAM
2C
3-4-1
test 512k base address lines
2E
3-4-3
test 512k base memory
32
test CPU bus-clock frequency
34
test CMOS RAM
37
reinitialize the chipset
38
shadow system BIOS ROM
39
reinitialize the cache
3A
autosize cache
3C
configure advanced chipset registers
3D
load alternate registers with CMOS values
40
set initial CPU speed
42
initialize interrupt vectors
44
initialize BIOS interrupts
46
2-1-2-3
check ROM copyright notice
47
initialize manager for PCI option ROMs
48
check video configuration against CMOS
49
initialize PCI bus and devices
4A
initialize all video adapters in system
