Intel BLKDX79TO manual Port 80h Post Codes, Error Messages and Indicators

Error Messages and Indicators

Port 80h POST Codes

During the POST, 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 and displayed on the Desktop Board’s seven-segment LED display shown in Figure 26. This code is useful for determining the point where an error occurred during the POST.

Figure 26. POST Code LED Display

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