Acer Aspire 7730 Series Service Manual page 160

POST Code
0x1A Initialize DMA command register with these settings:
1. Memory to memory disabled 2. Channel 0 hold
address disabled 3. Controller enabled 4. Normal
timing 5. Fixed priority 6. Late write selection 7.
DREQ sense active 8. DACK sense active low.
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
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Chapter 4