Advantech PCA-6145B Manual page 81

D.1 POST LEDs
Before the BIOS performs each system test, it writes a checkpoint code to
I/O address 80H. If the test fails, the code will stay in memory. You can
read the code and determine which test has failed.
The PCA-6145B/PCA-6145L's POST LED indicators make this process
extremely easy. You don't need any special diagnostic tools, you just
read the POST code from the LEDs.
The table below shows how to read the LEDs, a series of eight LEDs
located in the top left-hand corner of the board.
POST checkpoint LED indicators
The following list of POST codes gives the number of each checkpoint
for the AWARD BIOS POST. Codes are Copyright AWARD-BIOS
CHECK-POINT, (C) 1994 Award Software Inc.
71 Appendix D