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B-3
Appendix B: BIOS POST Checkpoint Codes
B-3 Uncompressed Initialization Codes
The following runtime checkpoint codes are listed in order of execution.
These codes are uncompressed in F0000h shadow RAM.
Checkpoint Code Description
03h The NMI is disabled. Next, checking for a soft reset or a power on condition.
05h The BIOS stack has been built. Next, disabling cache memory.
06h Uncompressing the POST code next.
07h Next, initializing the CPU and the CPU data area.
08h The CMOS checksum calculation is done next.
0Ah The CMOS checksum calculation is done. Initializing the CMOS status register for date and
time next.
0Bh The CMOS status register is initialized. Next, performing any required 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 verifi ed. 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 Next, programming the fl ash ROM.
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 confi guration 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 confi guration before initializing the
interrupt vectors.
24h The confi guration required before interrupt vector initialization has completed. Interrupt vector
initialization is about to begin.
25h Interrupt vector initialization is done. Clearing the password if the POST DIAG switch is on.
27h Any initialization before setting video mode will be done next.
28h Initialization before setting the video mode is complete. Confi guring the monochrome mode and
color mode settings next.
2Ah Bus initialization system, static, output devices will be done next, if present. See the last page
for additional information.