On Board LED Diagnostic                                
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When power is first applied to the card, an on-board diagnostic routine is run 
to verify that the major functional components of the board are operating      
correctly. The 80C20 bus master chip, the SCSI controller chip, the firmware   
PROM, the local RAM and internal data buses are tested. Results of the tests   
are indicated by an LED on the board.                                          
                                                                               
The LED will first turn on when power is applied. If the diagnostics find no   
malfunctions, the LED will then go off. In normal operation, the LED will be   
illuminated when command or SCSI bus activity occurs on the board.             
                                                                               
If an error is detected by the diagnostics, the LED will repeatedly flash a    
specific number of times, with a long pause between flashes, to indicate the   
board function which failed. This will continue until the board is powered down
or reset. Failure interpretation from the number of flashes is as follows:     
                                                                               
        Number of LED Flashes   Interpretation of the failure                  
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        Always on               Card is not operating or       
                                terminator are missing         
        1                       Firmware ROM checksum failure  
        2                       Local RAM test failure         
        3                       SCSI controller chip or        
                                SCSI interface failure         
        4                       Internal data bus failure      
        5                       Internal address bus failure   
        6                       Bus master chip failure        
        7                       SCSI drive type mismatch       
                                Single Ended drive connected on
                                differential SCSI bus          
        Constantly Flashing     Fuse Blown