Post Beep Codes; Phoenix Nubios Checkpoints; Table F-1. Phoenix Nubios Checkpoint Codes - HP VXI Pentium Series Hardware Installation And Configuration Manual

Phoenix NuBIOS
Checkpoints
Appendix F
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If valid BIOS code cannot be loaded from the BIOS memory, the controller
will issue two beeps and halt the CPU.
The rest of this appendix lists the codes which are written to the diagnostic
port of the HP VXI Pentium Controller during the power-on self-test
(POST) phase of the system boot. The POST Codes listed in the tables below
are viewable only by HP service personnel with the proper diagnostic
equipment.
The audible Beep Codes listed in the tables below will be issued only when
the associated self-test detects a failure. This information, if available, is
useful to the HP Service and Support Center when you report a problem.
The Phoenix NuBIOS writes a number of checkpoints to I/O port 80h just
before each self-test is executed. Note that the execution order of the POST
tests generally follows the order listed in the tables below, but not exactly.

Table F-1. Phoenix NuBIOS Checkpoint Codes

Beep POST
Code Code
02h Verify Real Mode
04h Get CPU type
06h Initialize system hardware
08h Initialize chipset registers with initial POST values
09h Set in POST flag
0Ah Initialize CPU registers
0Ch Initialize cache to initial POST values
0Eh Initialize I/O
10h Initialize Power Management
11h Load alternate registers with initial POST values
12h Jump to UserPatch0
14h Initialize keyboard controller
1-2-2-3 16h BIOS ROM checksum
18h 8254 timer initialization
1Ah 8237 DMA controller initialization
Appendix F

POST Beep Codes

Checkpoint Description
POST Beep Codes 67