Acer Aspire L100 Service Manual page 64

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Checkpoint
23h 1. Check validity of RTC value:
2. Load CMOS settings into BIOS stack. If CMOS checksum fails, use default
3. Prepare BIOS resource map for PCI & PnP use. If ESCD is valid, take into
4. Onboard clock generator initialization. Disable respective clock resource to
empty PCI
5. Early PCI initialization
24h Reserved
25h Reserved
26h Reserved
27h Initialize INT 09 buffer
28h Reserved
29h 1. Program CPU internal MTRR (P6 & PII) for 0-640K memory address.
2. Initialize the APIC for Pentium class CPU.
3. Program early chipset according to CMOS setup. Example: onboard IDE
controller.
4. Measure CPU speed.
5. Invoke video BIOS.
2Ah Reserved
2Bh Reserved
2Ch Reserved
2Dh 1. Initialize multi-language
2. Put information on screen display, including Award title, CPU type, CPU
speed...
2Eh Reserved
2Fh Reserved
30h Reserved
31h Reserved
32h Reserved
33h Reset keyboard except Winbond 977 series Super I/O chips.
34h Reserved
35h Reserved
36h Reserved
37h Reserved
38h Reserved
39h Reserved
3Ah Reserved
3Bh Reserved
60
e.g. a value of 5Ah is an invalid value for RTC minute.
value
instead.
consideration of the ESCD's legacy information.
& DIMM slots.
-Enumerate PCI bus number
-Assign memory & I/O resource
-Search for a valid VGA device and VGA BIOS, and put it into C000:0
Description
Chapter 4