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70 Setup Init Display setup message and enable setup
functions Detect if mouse is present,
initialize mouse, install interrupt
vectors. Special treatment to PS2
Mouse port
ACPI sub-system initializing
71 Setup Cache
Controller
Initialize cache controller.
72 Install FDD Enter setup check and auto-
configuration check up
Initialize floppy disk drive
controller and any drives.
Install FDD and setup BIOS data area
parameters
73 Install HDD Initialize hard drive controller and
any drives.
IDE device detection and install
Initialize any serial and parallel
ports (also game port).
74 Detect & Initialize
Math Coprocessor
Initialize math coprocessor.
75 HDD Check for Write
protection
HDD check out
76 Reserved
77 Display POST error Check POST error and display them
and ask for user intervention
Ask password security (optional).
78 CMOS and Option ROM
Init
Write all CMOS values back to RAM and
clear screen.
Enable parity checker
Enable NMI, Enable cache before boot.
Initialize any option ROMs present
from C8000h to EFFFFh.
NOTE: When FSCAN option is enabled,
ROMs initialize from C8000h to
F7FFFh.
79 Reserved
7A Reserved
7B Reserved
7C Reserved
7D Boot Medium
detection
Read and store boot partition head and
cylinders values in RAM
7E Final Init Final init for last micro details
before boot
7F Special KBC patch Set system speed for boot
Setup NumLock status according to Setup
80 Boot Attempt Set low stack Boot via INT 19h.
FF Boot
S4 POST Codes
Code(hex) Name Description
5A Early Chipset Init Early Initialized the super IO