Motherboard Manual
50
CODE
Name
Description
49
Size Base and Extended
Memory
Find and display the size of base memory (0-640k) and
extended memory (1M+)
4E Program CPU and APIC
Program CPU's MTRR and Initial APIC
4F show message
show BIOS message
50 initial USB
USB initialization
52 Memory Test
Test all memory of memory above 1MB
55 CPU display
Show CPU Type
57 initial PNP
PNP Display Logo and PNP Early init
59 Setup virus protect
Setup virus protect according
5D initial Onboard I/O
Onboard SuperIO,AUDIO initialization
60 Setup enable
Print setup message and enable setup functions
65 Test PS/2 Mouse
Test PS/2 pointing device installed and initialize
67 initial ACPI table
initial ACPI table and Check PCI card need EBDA support
69 Initial Cache
Initialize cache controller
6B Programs the chipset
Programs the chipset registers with AUTO table
6D Assign SuperIO
Assign system resources for COM/LPT/FDD
6F Initial FDD
Initialize floppy controller
73 Force IRQ 12
Force IRQ 12 to be tri-state if no PS2 mouse plugged
75 Install HDD
IDE device detect and install
77 Initial COM
Initialize serial ports
7A Initial LPT
Initialize parallel ports
7F Report the USB keyboard
Report the USB keyboard's existence and Display Setup
messages
82 Security Check
Check security and ask for password
83 Write CMOS
Write all of CMOS back to RAM
84 Assign PNP cards
Assign system resources for the all PNP cards
85 Initial Final USB
USB Final Initialization
87 check clear screen
check clear screen
89 Setup ACPI
Setup ACPI tables and initial special treatment before option
8B Setup Data
Setup BIOS Data , Memory Map ,IDE Device Type
8C Setup CMOS
Save standard CMOS and extended CMOS
8D Initial APM
Initialize the APM low level interface
8F enable IRQ 12
enable IRQ 12 for PS2 mouse
93 Check SCSI
Check SCSI Boot Sequence
94 Final Initial
Final Initial for last microsecond details before boot
95 Special KBC patch
Force keyboard NUM-LOCK on
96 Setup stack and boot
Setup low stack and boot
FF Boot