B-1
APPENDIX
B
BIOS POST Codes
Typically, the BIOS displays warning or error messages on the video display in the
event of hardware or configuration errors.
However, in some cases the error may be so severe that the BIOS halts immediately
or the BIOS might be unable to initialize video. In these cases, it can be useful to
determine the last power-on self-test (POST) task that the BIOS was executing. This
is indicated by the value written to port 80.
You can read the port 80 codes from the LED on the Sun Fire X2100 Server
motherboard. The location of this LED is shown in
FIGURE B-1. The BIOS POST codes
are listed in the following table.
FIGURE B-1 POST Code LED Location
POST Code LED
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