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Advanced/RH Technical Product Specification 
••
 Page 44
Appendix J
−−
 AMIBIOS Error messages and Beep Codes
Errors can occur during POST (Power On Self Test) which is performed every time the system is powered on.  Fatal
errors, which prevent the system from continuing the boot process, are communicated through a series of audible
beeps.  Other errors are displayed in the following format:
ERROR Message Line 1
ERROR Message Line 2
For most displayed error messages, there is only one message. If a second message appears, it is "RUN SETUP". If
this message occurs, press <F1> to run AMIBIOS Setup.
BEEP CODES
Beeps
Error Message
Description
1
Refresh Failure
The memory refresh circuitry on the motherboard is faulty.
2
Parity Error
Parity is not supported on this product, will not occur.
3
Base 64 KB Memory Failure
Memory failure in the first 64 KB.
4
Timer Not Operational
Memory failure in the first 64 KB of memory, or Timer 1 on the motherboard is not
functioning.
5
Processor Error
The CPU on the motherboard generated an error.
6
8042 - Gate A20 Failure
The keyboard controller (8042) may be bad. The BIOS cannot switch 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
ROM checksum value does not match the value encoded in BIOS.
10
CMOS Shutdown Register Rd/Wrt Error
The shutdown register for CMOS RAM failed.
1 LONG
3 SHORT
VIDEO ERROR
Video Controller failure
ERROR MESSAGES
Error Message
Explanation
8042 Gate - A20 Error
Gate A20 on the keyboard controller (8042) is not working. Replace the 8042.
Address Line Short!
Error in the address decoding circuitry on the motherboard.
Cache Memory Bad, Do Not Enable Cache!
Cache memory is defective. Replace it.
CH-2 Timer Error
Most AT systems include two timers. There is an error in timer 2.
CMOS Battery State Low
CMOS RAM is powered by a battery. The battery power is low. Replace the battery.
CMOS Checksum Failure
After CMOS RAM values are saved, a checksum value is generated for error checking. The
previous value is different from the current value. Run AMIBIOS Setup.
CMOS System Options Not Set
The values stored in CMOS RAM are either corrupt or nonexistent. Run Setup.
CMOS Display Type Mismatch
The video type in CMOS RAM does not match the type detected by the BIOS. Run AMIBIOS
Setup.
CMOS Memory Size Mismatch
The amount of memory on the motherboard is different than the amount in CMOS RAM. Run
AMIBIOS Setup.