System resources
64
17h Initializes external cache before memory auto size.
18h Initializes the timers.
1Ah Tests the DMA registers.
1Ch Initializes interrupt controllers for some shutdowns.
20h Verifies DRAM refresh.
22h Initializes the Keyboard Controller for Keyboard Test.
24h Sets 4GB segments for DS,ES,FS,GS,SS.
28h Sizes DRAM.
29h Initializes the POST Memory Manager.
2Ah Zeroes the RAM up to the minimum RAM specified in the chipset RAM table.
2Ch Tests address lines of the RAM.
2Eh Tests the first 4MB of RAM.
2Fh Initializes external cache before shadowing.
32h Computes CPU clock speed in MHz.
33h Initializes the Phoenix Dispatch Manager.
34h Tests the CMOS RAM and RTC (S2D)
36h Vector to the proper shutdown routine.
38h Shadows system BIOS ROM.
3Ah Auto sizes the external cache.
3Ch Advanced chipset configuration.
3Dh Alternates register configuration.
42h Initializes interrupt vectors.
45h POST device initialization.
46h Verifies that the copyright message is intact.
48h Verifies the hardware configuration and notes whether the system has color or monochrome
video.
49h Initializes the Plug and Play, and PCI.
4Ah Initializes the video device.
4Bh Initializes QuietBoot (splash screen).
4Ch Shadows video BIOS ROM.
4Eh Displays the copyright message.
4Fh Allocates storage for Multiboot tables.
50h Displays the CPU type and speed.
52h Initializes and Configures the Keyboard & PS/2 Mouse.
55h Configures USB devices.
58h Tests hot interrupts
59h Initializes the POST display service.
5Ah Displays “Press F2 for Setup“prompt.
5Bh Disables L1 cache.
5Ch Determines size of conventional memory.
Checkpoint Code Description
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