Onboard Status Display; Post Code Displayer - Abit AN9 32X User Manual

2.7 Onboard Status Display

2.7.1 POST Code Displayer

This is an LED device to display the "POST" Code, the acronym of Power On Self Test. The
computer will execute the POST action whenever you power on the computer. The POST
process is controlled by the BIOS. It is used to detect the status of the computer's main
components and peripherals. Each POST Code corresponds to different checkpoints that are
also defined by the BIOS in advance. For example, "memory presence test" is an important
checkpoint and its POST Code is "C1". When the BIOS execute any POST item, it will write the
corresponding POST Code into the address 80h. If the POST passes, the BIOS will process the
next POST item and write the next POST Code into the address 80h. If the POST fails, we can
check the POST Code in address 80h to find out where the problem lies.
This LED device also displays the "POST" Code of AC2005, an "uGuru" chipset developed
exclusively by ABIT computer.
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The decimal point lights up during the AC2005 POST action.
See Appendix for both AWARD and AC2005 POST Code definitions.
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