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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.
Chapter 4 AMIBIOS POST
50
Beeps
Error message
1
Refresh Failure
2
Parity Error
3
Base 64 KB Memory
Failure
4
Timer Not Operational
5
Processor error
6
8042 - Gate A20
Failure
7
Processor Exception
Interrupt Error
8
Display Memory
Read/Write Error
9
ROM Checksum Error
10
CMOS Shutdown
Register Read/Write
Error
11
Cache memory bad —
do not enable cache
Description
The memory refresh circuitry on the
motherboard is faulty.
A parity error was detected in the base memory
(the first 64 KB block) of memory.
Memory failure in first 64 KB.
A memory failure occurred within the first 64
KB of memory. Or Timer 1 on the motherboard
is not functioning.
The CPU generated an error.
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.
The CPU generated an exception interrupt.
The system video adapter is either missing or
its memory is faulty. This is not a fatal error.
The ROM checksum does not match the value
encoded in the BIOS.
The shutdown register for CMOS RAM failed.
The cache memory test failed. Cache memory
is disabled.
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