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1Dh Initial EARLY_PM_INIT switch
1Eh
Reserved
1Fh
Load keyboard matrix (notebook platform)
20h
Reserved
21h
HPM initialization (notebook platform)
22h
Reserved
Check validity of RTC value; Load CMOS settings into BIOS
stack. If CMOS checksum fails, use default value instead; Prepare
BIOS resource map for PCI & PnP use. If ESCD is valid, take into
consideration of the ESCD's legacy information; Onboard clock
23h
generator initialization. Disable respective clock resource to empty
PCI & DIMM slots; Early PCI initialization - Enumerate PCI bus
number, assign memory & I/O resource, search for a valid VGA device
& VGA BIOS, and put it into C000:0
24h
Reserved
25h
Reserved
26h
Reserved
27h
Initialize INT 09 buffer
28h
Reserved
Program CPU internal MTRR (P6 & PII) for 0-640K memory address;
29h
Initialize the APIC for Pentium class CPU; Program early chipset
according to CMOS setup; Measure CPU speed; Invoke video BIOS
2Ah
Reserved
2Bh
Reserved
2Ch Reserved
2Dh Initialize multilanguage; Put information on screen display, including
Award title, CPU type, CPU speed, etc...
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
3Ch Test 8254
3Dh Reserved
3Eh
Test 8259 interrupt mask bits for channel 1
3Fh
Reserved
40h
Test 9259 interrupt mask bits for channel 2
41h
Reserved
- 62 -
- 62 -
BIOS
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