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AppendixEP-3VCA2
A-7
2. Program all onboard super I/O chips (if any) including
COM ports, LPT ports, FDD port ... according to setup value.
33-3B Reserved.
3C Set flag to allow users to enter CMOS Setup Utility.
3D 1. Initialize Keyboard.
2. Install PS2 mouse.
3E Try to turn on Level 2 cache.
Note: Some chipset may need to turn on the L2 cache in
this stage.
But usually, the cache is turn on later in POST 61h.
3F-40 Reserved.
BF 1. Program the rest of the Chipset's value according to Setup.
(Later Setup Value Program)
41 2. If auto-configuration is enabled, program the chipset with
pre-defined Values.
42 Initialize floppy disk drive controller.
43 Initialize Hard drive controller.
45 If it is a PnP BIOS, initialize serial & parallel ports.
44 Reserved.
45 Initialize math coprocessor.
46-4D Reserved.
4E If there is any error detected (such as video, kb...), show all
error messages on the screen & wait for user to press <F1>
key.
4F 1. If password is needed, ask for password.
2. Clear the Energy Star Logo. (Green BIOS only)
50 Write all CMOS values currently in the BIOS stack area
back into the CMOS.
51 Reserved.
52 1. Initialize all ISA ROMs.
2. Later PCI initializations. (PCI BIOS only)
- assign IRQ to PCI devices.
- initialize all PCI ROMs.
3. PnP Initialzations. (PnP BIOS only)
- assign IO, Memory, IRQ & DMA to PnP ISA devices.
- initialize all PnP ISA ROMs.
4. Program shadows RAM according to Setup settings.