Acer Aspire 6930 Series Service Manual page 152

POST
Code
0x22 Reset the keyboard.
0x40 Test A20 line
0x67 Quick initialization of all Application Processors in a multi-
processor system
0x32 Compute CPU speed.
0x69 Initialize the handler for SMM.
0x6B If CMOS is bad, load Custom Defaults from flash into CMOS. If
successful, reboot.
0x3C If CMOS is valid, load chipset registers with values from
CMOS, otherwise load defaults and display Setup prompt. If
Auto Configuration is enabled, always load the chipset
registers with the Setup defaults (Rel 6.0).
0x3D Load alternate registers with CMOS values
0x42 Initialize interrupt vectors 0 thru 77h
0x46 Verify the ROM copyright notice
0x45 Initialize all motherboard devices.
0x49 1. Size the PCI bus topology and set bridge bus numbers.
2. Set the system max bus number.
3. Write a 0 to the command register of every PCI device.
4. Write a 0 to all 6 base registers in every PCI device.
5. Write a -1 to the status register of every PC
0xC6 Initialize note dock
0xC5 PnPnd dual CMOS (optional)
0x48 Verify that the equipment specified in the CMOS matches the
hardware currently installed. If the monitor type is set to 00
then a video ROM must exist. If the monitor type is 1 or 2 set
the video switch to CGA. If monitor type 3, set the video switch
to m
0xD1 Initialize BIOS stack
0xD3 Setup E820h and WAD memory map
0x24 Set segment-register addressability to 4 GB
0xCC Redirect Int 10h to enable target board to use a remote serial
video (PICO BIOS).
0x8A Initialize Extended BIOS Data Area and initialize the mouse.
0x9D Initialize Security Engine.
0x55 USB Initialization
0x52 Verify keyboard reset.
0x54 Initialize keystroke clicker if enabled in Setup.
0x76 Check status bits for keyboard-related failures. Display error
messages on the screen.
0x4A Initialize all video adapters in system
0x4C Shadow video BIOS ROM if specified by Setup, and CMOS is
valid and the previous boot was OK.
0x59 Register POST Display Services, fonts, and languages with
the POST Dispatch Manager.
0x57 Initialize 1394 Firewire
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Function Phase Component
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Chapter 4