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   C0    Turn Off Chipset  OEM Specific-Cache control             
         Cache                                                    

   1     Processor Test 1  Processor Status (1FLAGS) Verification.                          
                           Tests the following processor status flags:                                 
                             carry, zero, sign, overflow,          
                           The BIOS sets each flag, verifies      
                           they are set, then turns each flag     
                           off and verifies it is off.            

   2     Processor Test 2  Read/Write/Verify all CPU registers    
                           except SS, SP, and BP with data        
                           pattern FF and 00.                     

   3     Initialize Chips  Disable NMI, PIE, AIE, UEI, SQWV       
                           Disable video, parity checking, DMA    
                           Reset math coprocessor                 
                           Clear all page registers, CMOS shutdown byte                          
                           Initialize timer 0, 1, and 2, including set 
                             EISA timer to a known state                                  
                           Initialize DMA controllers 0 and 1     
                           Initialize interrupt controllers 0 and 1                                  
                           Initialize EISA extended registers.    

   4     Test Memory       RAM must be periodically refreshed to  
         Refresh Toggle    keep the memory from decaying.  This   
                           function ensures that the memory       
                           refresh function is working properly.  

   5     Blank video,      Keyboard controller initialization.    
         Initialize                                               
         keyboard                                                 

   6     Reserved                                                 

   7     Test CMOS         Verifies CMOS is working correctly,    
         Interface and     detects bad battery.                   
         Battery Status                                           

   BE    Chipset Default   Program chipset registers with power   
         Initialization    on BIOS defaults.                      

   C1    Memory presence   OEM Specific-Test to size on-board     
         test              memory                                 

   C5    Early Shadow      OEM Specific-Early Shadow enable for   
                           fast boot.                             

   C6    Cache presence    External cache size detection          
         test                                                     

   8     Setup low memory  Early chip set initialization          
                           Memory presence test                   
                           OEM chip set routines                  
                           Clear low 64K of memory                
                           Test first 64K memory.                 

   9     Early Cache       Cyrix CPU initialization               
         Initialization    Cache initialization                   

   A     Setup Interrupt   Initialize first 120 interrupt         
         Vector Table      vectors with SPURIOUS_INT_HDLR and     
                           initialize                             
                           INT 00h-1Fh according to INT_TBL       

   B     Test CMOS RAM     Test CMOS RAM Checksum, if bad, or     
         Checksum          insert key pressed, load defaults.     

   C     Initialize        Detect type of keyboard controller     
         keyboard          (optional)                             
                           Set NUM_LOCK status.                   

   D     Initialize Video  Detect CPU clock.                      
         Interface         Read CMOS location 14h to find out     
                           type of video in use.                  
                           Detect and Initialize Video Adapter.   

   E     Test Video        Test video memory, write sign-on       
         Memory            message to screen.                     
                           Setup shadow RAM - Enable shadow       
                           according to Setup.                    

   F     Test DMA          BIOS checksum test.                    
         Controller 0      Keyboard detect and initialization     

   10    Test DMA                                                 
         Controller 1                                             

   11    Test DMA Page     Test DMA Page Registers.               
         Registers                                                

 12-13   Reserved                                                 

   14    Test Timer        Test 8254 Timer 0 Counter 2.           
         Counter 2                                                

   15    Test 8259-1 Mask  Verify 8259 Channel 1 masked           
         Bits              interrupts by alternately turning off  
                           and on the interrupt lines.            

   16    Test 8259-2 Mask  Verify 8259 Channel 2 masked           
         Bits              interrupts by alternately turning off  
                           and on the interrupt lines.            

   17    Test Stuck        Turn off interrupts then verify no     
         8259's Interrupt  interrupt mask register is on.         
         Bits                                                     

   18    Test 8259         Force an interrupt and verify the      
         Interrupt         interrupt occurred.                    
         Functionality                                            

   19    Test Stuck NMI    Verify NMI can be cleared.             
         Bits (Parity/IO                                          
         Check)                                                   

   1A                      Display CPU clock                      

 1B-1E   Reserved                                                 

   1F    Set EISA Mode     If EISA non-volatile memory checksum   
                           is good, execute EISA initialization.  
                           If not, execute ISA tests an clear    
                           EISA mode flag.                        
                           Test EISA Configuration Memory         
                           Integrity (checksum & communication    
                           interface).                            

   20    Enable Slot 0     Initialize slot 0 (System Board).      

 21-2F   Enable Slots      Initialize slots 1 through 15.         
         1-15                                                     

   30    Size Base and     Size base memory from 256K to 640K     
         Extended Memory   and extended memory above 1MB.         

   31    Test Base and     Test base memory from 256K to 640K     
         Extended Memory   and extended memory above 1MB using    
                           various patterns.                      
                           NOTE: This test is skipped in EISA     
                           mode and can be skipped with ESC key   
                           in ISA mode.                           

   32    Test EISA         If EISA Mode flag is set then test     
         Extended Memory   EISA memory found in slots             
                           initialization.                        
                           NOTE:  This test is skipped in ISA     
                           mode and can be skipped with ESC key   
                           in EISA mode.                          

 33-3B   Reserved                                                 

   3C    Setup Enabled                                            

   3D    Initialize &      Detect if mouse is present,            
         Install Mouse     initialize mouse, install interrupt    
                           vectors.                               

   3E    Setup Cache       Initialize cache controller.           
         Controller                                               

   3F    Reserved                                                 

   BF    Chipset           Program chipset registers with Setup   
         Initialization    values                                 

   40                      Display virus protect disable or       
                           enable                                 

   41    Initialize        Initialize floppy disk drive           
         Floppy Drive &    controller and any drives.             
         Controller                                               

   42    Initialize Hard   initialize hard drive controller and   
         Drive &           any drives.                            
         Controller                                               

   43    Detect &          Initialize any serial and parallel     
         Initialize        ports (also game port).                
         Serial/Parallel                                          
         Ports                                                    

   44    Reserved                                                 

   45    Detect &          Initialize math coprocessor.           
         Initialize Math                                          
         Coprocessor                                              

   46    Reserved                                                 

   47    Reserved                                                 

  48-4D  Reserved                                                 

   4E    Manufacturing     Reboot if Manufacturing POST Loop pin  
         POST Loop or      is set.  Otherwise display any         
         Display Messages  messages (i.e., any non-fatal errors   
                           that were detected during POST) and    
                           enter Setup.                           

   4F    Security Check    Ask password security (optional).      

   50    Write CMOS        Write all CMOS values back to RAM and  
                           clear screen.                          

   51    Pre-boot Enable   Enable parity checker                  
                           Enable NMI, Enable cache before boot.  

   52    Initialize        Initialize any option ROMs present     
         Option ROMs       from C8000h to EFFFFh.                 
                           NOTE:  When FSCAN option is enabled,   
                           ROMs initialize from C8000h to         
                           F7FFFh.                                

   53    Initialize Time   Initialize time value in 40h: BIOS     
         Value             area.                                  

   60    Setup Virus       Setup virus protect according to       
         Protect           Setup                                  

   61    Set Boot Speed    Set system speed for boot              

   62    Setup NumLock     Setup NumLock status according to      
                           Setup                                  

   63    Boot Attempt      Set low stack                          
                           Boot  via INT 19h.                     

   B0    Spurious          If interrupt occurs in protected       
                           mode.                                  

   B1    Unclaimed NMI     If unmasked NMI occurs, display        
                           Press F1 to disable NMI, F2 reboot.    

 E1-EF   Setup Pages       E1- Page 1, E2 - Page 2, etc.          

   FF    Boot  

   C1    Memory presence   OEM Specific-Test to size on-board      
          test              memory