2-4 Troubleshooting
COMPAQ CONFIDENTIAL - NEED TO KNOW REQUIRED
Writer: David Calvert Saved by: David Calvert Saved date: 03/29/00 7:07 AM
Part Number: 177845-001 File name: CH02.doc
Table 2-1 continued
Code Description
2Fh Signon messages displayed.
30h Special init of keyboard ctlr.
31h Test if keyboard present.
32h Test keyboard interrupt.
33h Test keyboard command Byte.
34h Test, blank and count all RAM.
35h Protected mode entered safely (2).
36h RAM test complete.
37h Protected mode exit successfully.
38h Update keyboard output port to disable gate of A20.
39h Setup cache controller.
3Ah Test if 18.2Hz periodic working.
3Bh Initialize BIOS data area at 40.0.
3Ch Initialize the hardware interrupt vector table.
3Dh Search and initialize the mouse
3Eh Update NUMLOCK status.
3Fh OEM initialization of COM and LPT ports.
40h Configure the COM and LPT ports.
41h Initialize the diskette drive.
42h Initialize the hard disk.
43h OEM’s unit of PM with USB.
44h Initialize additional ROMs.
45h Update NUMLOCK status.
46h Test for coprocessor installed.
47h OEM’s unit of power management (check SMI).
48h OEM’s functions before boot (PC Card, CardBus).
49h Dispatch to operation system boot.
4Ah Jump into bootstrap code.
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