Table of Contents
Advertisement
Table E-1
POST Checkpoint List
Checkpoint
23h
Detects whether keyboard
yes, set BIOS Setup parameter too default settings; or keep the original settings.
24h
Tests programmable interrupt controller (8259)
Initializes system interrupt
30h
Enables system shadow RAM
34h
Memory sizing
5Ah
Changes SMBASE, copy SMI Handler.
56h
Issues 1st software SMI to communicate with PMU.
Initializes the SMI environment.
3Fh
Enable/Disable USB function
3Ch
Initializes interrupt vectors
3Eh
Set fixed CMOS setting
4Ch
CPU clock checking
Sets the DRAM timing in correspondent to the system speed
35h
Scans PCI Devices to Initialize the PCI buffer that used by BIOS.
4Eh
Isolations for PnP ISA Card
4Fh
Configurations for PnP ISA Card
Initializes the PCI device according to ESCD data (if ESCD data is valid).
Initialize the PCI Devices by BIOS
Initialize the PCI VGA card
50h
Initializes video display
Note: If system has any display card, here it should be initialized via its I/O ROM or
Exh
VGA BIOS POST.
54h
Enables video shadow RAM
58h
Displays Acer (or OEM) logo (if necessary)
Displays Acer copyright message (if necessary)
Displays BIOS serial number
5Ch
Memory testing
5Eh
Assign PCMCIA resource, enable serial IRQ
60h
External Cache sizing
Enables/disables L1/L2 cache according to the BIOS SETUP
64h
Tests keyboard interface
Note: The keyboard LEDs should flash once.
u
corresponding initialization program.
Description
is depressed from system powered-on till POST or not. If
Advertisement
Table of Contents
