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BIOS
- 44 -
24h
25h
26h
27h
28h
29h
2Ah
2Bh
2Ch
2Dh
Eh
2Fh
30h
31h
32h
33h
34h
35h
36h
37h
38h
39h
3Ah
3Bh
3Ch
3Dh
3Eh
3Fh
40h
41h
42h
43h
44h
Reserved
Reserved
Reserved
Initialize INT 09 buffer
Reserved
Program CPU internal MTRR (P6 & PII) for 0-640K memory address;
Initialize the APIC for Pentium class CPU; Program early chipset
according to CMOS setup; Measure CPU speed; Invoke video BIOS
Reserved
Reserved
Reserved
Initialize multilanguage; Put information on screen display, including
Award title, CPU type, CPU speed, etc...
Reserved
Reserved
Reserved
Reserved
Reserved
Reset keyboard except Winbond 977 series Super I/O chips
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Test 8254
Reserved
Test 8259 interrupt mask bits for channel 1
Reserved
Test 9259 interrupt mask bits for channel 2
Reserved
Reserved
Test 8259 functionality
Reserved
BIOS
- 45 -
45h
46h
47h
48h
49h
4Ah
4Bh
4Ch
4Dh
4Eh
4Fh
50h
51h
52h
53h
54h
55h
56h
57h
58h
59h
5Ah
5Bh
5Ch
5Dh
5Eh
5Fh
60h
61h
Reserved
Reserved
Initialize EISA slot
Reserved
Calculate total memory by testing the last double last word of each
64K page; Program writes allocation for AMD K5 CPU
Reserved
Reserved
Reserved
Reserved
Program MTRR of M1 CPU; initialize L2 cache for P6 class CPU &
program cacheable range; Initialize the APIC for P6 class CPU; On
MP platform, adjust the cacheable range to smaller one in case the
cacheable ranges between each CPU are not identical
reserved
Initialize USB
Reserved
Test all memory (clear all extended memory to 0)
Reserved
Reserved
Display number of processors (multi-processor platform)
Reserved
Display PnP logo; Early ISA PnP initialization and assign CSN to
every ISA PnP device
Reserved
Initialize the combined Trend Anti-Virus code
Reserved
Show message for entering AWDFLASH.EXE from FDD
(optional feature)
Reserved
Initialize Init_Onboard_Super_IO switch; Initialize Init_Onboard_
AUDIO switch
Reserved
Reserved
Okay to enter Setup utility
Reserved