Specifications

Code(hex) Name Description
45 Reinit serial port Reinitialize Preboot agent serial port
46 Reserved
47 EISA Test If EISA non-volatile memory checksum is good,
execute EISA initialization. If not, execute ISA tests
and clear EISA mode flag.
48 Reserved
49 Size Memory Size base memory from 256K to 640K and extended
memory above 1MB.
4A Reserved
4B Reserved
4C Reserved
4D Reserved
4E Init APIC Initialize APIC and set MTRR
4F Reserved
50 USB init Initialize USB controller
51 Reserved
52 Memory Test Test all memory of memory above 1MB using Virtual
8086 mode, page mode and clear the memory
53 Reserved
54 Reserved
55 CPU display Detect CPU speed and display CPU vendor specific
version string and turn on all necessary CPU features
56 Reserved
57 PnP Init Display PnP logo and PnP early init
58 Reserved
59 Setup Virus Setup virus protect according to protect setup
5A Reserved
5B Awdflash Load If required, will auto load Awdflash. exe in POST
5C Reserved
5D Onboard I/O Init Initializing onboard superIO
5E Reserved
5F Reserved
60 Setup enable Display setup message and enable setup functions
61 Reserved
62 Reserved
63 Initialize Mouse Detect if mouse is present, initialize mouse, install
interrupt vectors.
64 Reserved
65 PS2 Mouse special Special treatment to PS2 Mouse port
66 Reserved
67 ACPI init ACPI sub-system initializing
68 Reserved
69 Init Cache Initialize cache controller
6A Reserved
6B Setup Enter setup check and auto configuration check up
6C Reserved