D2 Check and wake up system
D3 Prepare system for memory detection and sizing
D4 Memory test
D5 Copy BIOS from ROM to RAM
C0 Early CPU initiation
C5 Wake up AP
0A Initiate KBC8042
0B Detect PS2 mouse
0C Detect PS2 keyboard
2A Initiate VGA BIOS
38 USB initiation
52 Detect System RAM75 Detect IDE
78 Initiate option ROM
85 Show post error
87 Enter BIOS setup
A4 BIOS boot menu
AC OS in PIC mode
AA OS in APIC mode
01 S1
03 S3
04 S4
05 S5
10 Resume from S1
30 Resume from S3
40 Resume from S4
00 Leave BIOS and pass control to OS