B
POST 80 codes
53
93h
Creates MP tables.
95h
Tests CDROM.
96h
Exits big real mode.
97h
Fixes up the MP table physical pointer and checksum.
98h
Configures non-PC-compatible Plug and Play ISA devices, PCI IRQs, enable PCI devices and
ROM-scan.
99h
Checks SMART status.
9Ch
Late SMM (system memory mode) initialization.
9Dh
Initializes the system security engine.
9Eh
Enables the proper hardware interrupts.
A0h
Sets time of day.
A2h
Tests if key lock or keyboard controller password is on.
A8h
Removes the “Press F2 for Setup“prompt.
AAh
Checks if User has requested to enter setup.
ACh
Checks to see if setup should be executed.
AEh
Clears ConfigFailedBit and InPostBit in CMOS.
B0h
Checks for POST errors.
B2h
Clears CMOS bits to indicate that POST is complete.
B3h
Stores enhanced CMOS values in non-volatile area.
B5h
Terminates QuietBoot (splash screen).
B6h
Queries for password before boot.
B7h
Configures ACPI tables for OS use.
B9h
Prepares to boot.
BAh
Executes DMI handlers.
BCh
Clears the parity error latch, set correct NMI state.
BDh
Displays the “boot first“menu.
BEh
Clears the screen.
BFh
Checks the reminder features (virus, backup).
C0h
Boots to operating system via Int19.
C1h
Initializes PEM (Phoenix Error Manager) data structures
C2h
Saves the current boot type into CMOS.
C2h
Invokes error logging function for all registered error handlers.
C3h
Checks the requested boot type.
C3h
Invokes error handler(s) for asserted errors.
C4h
Initializes (clears) the system error flags.
C4h
Installs the IRQ1 vector.
C5h
Marks the fact that BIOS is no longer in POST.
C6h
Installs console redirection module.
C7h
Removes the COM port address used by console redirection from BDA.
C8h
Performs A20 Test.
C9h
Checksum the entire BIOS and do a flash recovery if necessary.
CCh
Restores the memory configuration.
CDh
Reclaims console vectors after HW vectors initialized.
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