
CHIPS AND TECHNOLOGIES BIOS


POSTcode       TEST-DESCRIPTION

  00           Error in POS register, going to test flag register.
  
  01           Flag register test failed, going to test CPU registers.
              
  02           CPU register test failed.
            
  03           System ROM failed checksum.
         
  04           DMA Controller test failed.
            
  05           System timer test failed. 
  
  06           Base 64k address test failed.
      
  07           Base 64k RAM test failed.
          
  08           Interrupt Controller test failed.
      
  09           Hot Interrupt occurred.
            
* 0A           Reserved or System Timer failed to generate IRQ 0.
  
  0B           CPU still in protected mode.
       
  0C           DMA page register test failed.
        
  0D           Refresh not occuring.
              
  0E           Keyboard Controller is not responding.
    
  0F           Could not Enter Protected Mode.
  
  *** CPU register test codes: ********************************************

  10           GDT or IDT register failed.
       
  11           LDT register failed.
              
  12           task register failed.
             
  13           LSL instruction failed.
          
  14           LAR instruction failed.
          
  15           VERR/VERW failed
  
  *************************************************************************
                
  16           Keyboard controller: gate A20 failed.
   
  17           Exception failed / unexpected exception.
       
  18           Shutdown during memory test.
        
* 19           Last used error code or copyright checksum error.
         
* 1A           Copyright checksum error or BMS checksum error.
  
* 1B           Shutdown during memory sizing or reserved.

* 1C           Chipset initialisation or reserved.
  
  50           Initialize hardware.
               
  51           Initialize timer.
                
  52           DMA initialization.
              
  53           Programmable interrupt controller (8259) initialization.
             
  54           Initialize chipset.
  
* 55           Setup BMS configuration or reserved.
               
  56           Enter protected mode first time.
   
  57           Size memory RAM chips.
                    
* 58           Configure memory chip interleave or reserved.
       
  59           Exiting protected mode for first time.
    
  5A           Determine system board memory size.
       
  5B           Relocate shadow RAM.
               
  5C           Configure EMS.
           
* 5D           Setup wait state configuration or reserved.
 
  5E           Re-Test base 64k RAM after RAM sizing.
             
  5F           Test shadow RAM.
                   
  60           CMOS RAM test.
                  
  61           Video test.
                        
  63           Protected mode interrupt test.
     
  64           Test A20 line.
                     
  65           Test memory address lines.
         
  66           Memory test.
            
  67           Extended memory test.
  
  68           Timer interrupt test.
             
  69           Real-time clock (RTC) test.
      
  6A           Keyboard test.
                    
  6B           Coprocessor test.
                 
  6C           Serial port test.
                       
  6D           Parallel port test.

* 6E           Dual card test or reserved.
             
  6F           Floppy drive and controller test.
                 
  70           Fixed disk and controller test.
                   
  71           Keylock test.
                     
  72           Mouse (pointing device) Test.
   
  73 - 8F      reserved.
  
  90           RAM setup.
                        
  91           Calculate CPU speed.
               
  92           Check configuration.
              
  93           BIOS initialization.
                  
  94           POD bootstrap, determine boot device and give control to
               INT 19h bootloader.
                                  
  95           Reset hardware.
                        
* 96           POS select or Cache controller setup and initialization.
            
* 97           VGA power on diagnostics and setup.

* 98           Adaptor POS.

* A0           Exception 0 during POD.

* A1           Exception 1 during POD.

* A2           Exception 2 during POD.

* C0           Systen board memory failure.

* C1           I/O channel check aktivated.

* C2           Watchdog time out.

* C3           Bus time out.
