APPENDIX A - BIOS MESSAGES
BIOS BEEP CODES
Errors may occur during the POST (Power-On Self Test) routines which are
performed each time the system is powered on.
Non-fatal errors are those which, in most cases, allow the system to con-
tinue the bootup process. The error message normally appears on the
screen. See BIOS Error Messages later in this section for descriptions of
these messages.
Fatal errors are those which will not allow the system to continue the
bootup procedure.
These fatal errors are usually communicated through a series of audible
beeps. Each error message has its own specific beep code, defined by the
number of beeps following the error detection. The following table lists the
errors which are communicated audibly.
All errors listed, with the exception of #8, are fatal errors.
Beep
Count
Message
Description
1
Refresh Failure
The memory refresh circuitry of the processor
board is faulty.
2
Parity Error
A parity error was detected in the base memory
(the first block of 64KB) of the system.
3
Base 64KB Memory
A memory failure occurred within the first 64KB
Failure
of memory.
4
Timer Not Operational
A memory failure occurred within the first 64KB
of memory, or Timer #1 on the processor board
has failed to function properly.
5
Processor Error
The CPU (Central Processing Unit) on the
processor board has generated an error.
6
8042 - Gate A20 Failure The keyboard controller (8042) contains the
Gate A20 switch which allows the CPU to
operate in protected mode. This error message
means that the BIOS is not able to switch the
CPU into protected mode.
7
Processor Exception
The CPU on the processor board has generated
Interrupt Error
an exception interrupt.
BIOS MESSAGES
TECHNICAL REFERENCE
A-1
Summary of Contents for SB586TCP/166
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