System resources
66
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.
D1h Initializes BIOS stack space for runtime usage.
D3h Finds space for memory WAD and zero it.
D4h Gets the CPU brand string.
Checkpoint Code Description
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