Port 80H Post Codes - Intel AN430TX - Motherboard - ATX Technical Product Specification

AN430TX Motherboard Technical Product Specification
Table 43. BIOS Error Messages (continued)
Error Message
Previous boot incomplete - Default
configuration used
Real time clock error
Shadow Ram Failed at offset: nnnn
System battery is dead - Replace and
run SETUP
System cache error - Cache disabled
System CMOS checksum bad - run
SETUP
System RAM Failed at offset: nnnn
System timer error

4.2 Port 80h POST Codes

During POST (power-on self test), the BIOS generates diagnostic progress codes (POST codes) to
I/O port 80h. If the POST fails, execution stops and the last POST code generated is left at port
80h. This code is useful for determining the point where an error occurred.
Displaying the POST codes requires the use of an add-in card (often called a POST card). The
POST card can decode the port and display the contents on a medium such as a seven-segment
display. These cards can be purchased from JDR Microdevices or other sources.
The following table provides the POST codes that can be generated by the motherboard's BIOS.
Some codes are repeated in the table because that code applies to more than one operation.
72
Explanation
Previous POST did not complete successfully. POST loads default
values and offers to run Setup. If the failure was caused by
incorrect values and they are not corrected, the next boot will likely
fail. On systems with control of wait states, improper Setup settings
can also terminate POST and cause this error on the next boot.
Run Setup and verify that the wait-state configuration is correct.
This error is cleared the next time the system is booted.
Real-time clock fails BIOS test. May require board repair.
Shadow RAM failed at offset nnnn of the 64k block at which the
error was detected.
The CMOS clock battery indicator shows the battery is dead.
Replace the battery and run Setup to reconfigure the system.
RAM cache failed the BIOS test. BIOS disabled the cache.
System CMOS has been corrupted or modified incorrectly, perhaps
by an application program that changes data stored in CMOS. Run
Setup and reconfigure the system either by getting the Default
Values and/or making your own selections.
System RAM failed at offset nnnn of in the 64k block at which the
error was detected.
The timer test failed. Requires repair of system board.