Sun Microsystems Ultra 20 User Manual page 121

C
A P P E N D I X
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 might 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 POST task that the BIOS was executing. This is indicated by the
value written to port 80.
You can read the port 80 POST codes from the LED on the Sun Ultra 20 Workstation
motherboard. The location of this LED is circled in . The BIOS post codes
FIGURE C-1
are listed in .
TABLE C-1
C-1