Appendix B: BIOS POST Checkpoint Codes

 

 

 

initialization before the keyboard BAT command is issued.

0Ch

The keyboard controller input buffer is free. Next, issuing the BAT

 

command to the keyboard controller.

0Eh

The keyboard controller BAT command result has been verified.

 

Next, performing any necessary initialization after the keyboard

 

controller BAT command test.

0Fh

The initialization after the keyboard controller BAT command test is

 

done. The keyboard command byte is written next.

10h

The keyboard controller command byte is written. Next, issuing the

 

Pin 23 and 24 blocking and unblocking command.

11h

Next, checking if <End or <Ins> keys were pressed during power on.

 

Initializing CMOS RAM if the Initialize CMOS RAM in every boot

 

AMIBIOS POST option was set in AMIBCP or the <End> key was

 

pressed.

12h

Next, disabling DMA controllers 1 and 2 and interrupt controllers 1 and

 

2.

13h

The video display has been disabled. Port B has been initialized. Next,

 

initializing the chipset.

14h

The 8254 timer test will begin next.

19h

The 8254 timer test is over. Starting the memory refresh test next.

1Ah

The memory refresh line is toggling. Checking the 15 second on/off

 

time next.

2Bh

Passing control to the video ROM to perform any required configu-

 

ration before the video ROM test.

2Ch

All necessary processing before passing control to the video ROM

 

is done. Looking for the video ROM next and passing control to it.

2Dh

The video ROM has returned control to BIOS POST. Performing any

 

required processing after the video ROM had control.

23h

Reading the 8042 input port and disabling the MEGAKEY Green

 

PC feature next. Making the BIOS code segment writable and

 

performing any necessary configuration before initializing the

 

interrupt vectors.

24h

The configuration required before interrupt vector initialization

 

has completed. Interrupt vector initialization is about to begin.

B-3

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American Megatrends X6DVA-EG, X6DVA-4G user manual Video ROM has returned control to Bios POST. Performing any

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