HP XU800 - Manual (Page 118)

118
6 Tests and Error Messages
Order in Which POST Tests Are Performed
0Eh Keyboard controller BAT command result has been verified. Next performing any
necessary initialization after the keyboard controller BAT command test.
0Fh Keyboard command byte is then written.
10h Issuing the Pin 23 and 24 blocking and unblocking commands.
11h Checking if the <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 Disabling DMA controllers 1 and 2, and Interrupt controllers 1 and 2.
13h Video display has been disabled. Port B has been initialized. Then, initializing the chipset.
14h 8254 timer initialization.
19h Initializing memory refresh test.
1Ah memory refresh line is toggling. Checking the 15 second on/off time.
23h Reading the 8042 input port and disabling the MEGAKEY Green PC feature. Making the
BIOS code segment writable and performing any necessary configuration before
initialization the interrupt vectors.
24h Configuration required before Interrupt vector initialization has completed. Then Interrupt
vector initialization begins.
25h Clearing the password if the POST DIAG switch is on.
27h Setting video mode.
28h Video ROM performs any required configuration before the video ROM test.
2Ah System bus initialization, static, output devices, if present.
2Bh Video ROM performs any required configuration before testing.
2Ch All necessary processing before passing control to the Video ROM is completed. Video
ROM is searched, then control passed on to it.
2Dh Video ROM returns control to the BIOS POST. Performing any required processing after
the video
2Eh If the EGA/VGA controller is not found, performing the display memory read/write test.
2Fh The EGA/VGA controller was not found. The display memory read/write test begins.
Checkpoint
Code
POST Routine Description (Continued)
(A Check Point Code is NOT an error code or error number)