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BIOS
47h Initialize EISA slot
48h Reserved
49h
Calculate total memory by testing the last double last word of each
64K page; Program writes allocation for AMD K5 CPU
4Ah Reserved
4Bh Reserved
4Ch Reserved
4Dh Reserved
4Eh
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
4Fh Reserved
50h Initialize USB
51h Reserved
52h Test all memory (clear all extended memory to 0)
53h Reserved
54h Reserved
55h Display number of processors (multi-processor platform)
56h Reserved
57h
Display PnP logo; Early ISA PnP initialization and assign CSN to
every ISA PnP device
58h Reserved
59h Initialize the combined Trend Anti-Virus code
5Ah Reserved
5Bh
Show message for entering AWDFLASH.EXE from FDD (optional
feature)
5Ch Reserved
5Dh
Initialize Init_Onboard_Super_IO switch; Initialize Init_Onboard_
AUDIO switch
5Eh Reserved
5Fh Reserved
60h Okay to enter Setup utility
61h Reserved
62h Reserved
63h Reserved
64h Reserved
65h Initialize PS/2 mouse
66h Reserved
67h Prepare memory size information for function call: INT 15h ax=E820h
68h Reserved
69h Turn on L2 cache
6Ah Reserved
6Bh
Program chipset registers according to items described in Setup &
$XWR&RQ¿JXUDWLRQWDEOH
6Ch Reserved
6Dh
Assign resources to all ISA PnP devices; Auto assign ports to onboard
COM ports if the corresponding item in Setup is set to “AUTO”
6Eh Reserved
6Fh ,QLWLDOL]HÀRSS\FRQWUROOHU6HWXSÀRSS\UHODWHG¿HOGVLQKDUGZDUH