BIOS

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

23h

consideration of the ESCD's legacy information; Onboard clock

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

42h

Reserved

43h

Test 8259 functionality

44h

Reserved

45h

Reserved

46h

Reserved

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Page 51
Image 51
Diamond Systems LX800 PC/104 user manual Bios