Chapter 4 AMIBIOS POST
50
Beep Codes
Fatal errors, listed below, are communicated through a series of audible beeps. All errors except Beep Code
8 are fatal. Fatal errors halt the boot process.
In most cases, displayed errors allow the system to continue. AMIBIOS displayed errors are described on
page 51.
Beeps
Error message
Description
1
Refresh Failure
The memory refresh circuitry on the
motherboard is faulty.
2
Parity Error
A parity error was detected in the base memory
(the first 64 KB block) of memory.
3
Base 64 KB Memory
Failure
Memory failure in first 64 KB.
4
Timer Not Operational
A memory failure occurred within the first 64
KB of memory. Or Timer 1 on the motherboard
is not functioning.
5
Processor error
The CPU generated an error.
6
8042 - Gate A20
Failure
Gate A20 on the keyboard controller (8042)
allows the CPU to operate in protected mode.
The BIOS is not able to switch the CPU to
protected mode.
7
Processor Exception
Interrupt Error
The CPU generated an exception interrupt.
8
Display Memory
Read/Write Error
The system video adapter is either missing or
its memory is faulty. This is not a fatal error.
9
ROM Checksum Error
The ROM checksum does not match the value
encoded in the BIOS.
10
CMOS Shutdown
Register Read/Write
Error
The shutdown register for CMOS RAM failed.
11
Cache memory bad —
do not enable cache
The cache memory test failed. Cache memory
is disabled.
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