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HP POST Procedures

Code

Meaning

CPU

Registers in CPU tested with data patterns; error flags are set, verified and reset.

ROM BIOS Checksum

Checksums are performed on High and low BIOS Chips.

PIC Test

Test Timer Channels 0-2 then the memory refresh signal. Initialise timer if tests are passed. Check the 8254 chip.

64K Test

Walking-bit and address collision tests are performed on the first 64K of memory. Check for a bad memory chip or address line.

Cache Controller

Test the CPU cache controller and memory.

Video Adapter

Initialise the video adapter. If EGA/VGA is present wait for adapter to finish internal diagnostics. check the adapter or for improper setup.

DMA Test

Bit-patterns written to all DMA controller registers (inc page registers) and verifies the patterns written. If the tests pass the registers are reset and the controller initialised.

PIC Test

Test mask register of master and slave interrupt controllers. Generate interrupt and monitor CPU to test success. Failure is normally down to the PIC but the interrupt test uses the BIOS clock (interrupt) and the RTC so check those.

Keyboard Controller

Perform several tests on the 8042 keyboard controller then send a series of interrupt request commands via the 8259 PIC.

HP-HIL Test

Test the HP-HIL (Hardware Interrupt Level) controller with data patterns and verify it.

CMOS Test

Perform a checksum on the standard and extended CMOS RAM areas; perform a register test and check Byte 0D to determine power status. Check the CMOS extended CMOS RAM or battery respectively.

Manufacturing Test

Search for diagnostic tool used in manufacturing and run predetermined tests if found. Otherwise continue POST.

Base Memory Test

Test RAM between 64-640K with several pattern tests; the bit failure and bank can be determined by the displayed hex code.

Ext Memory Test

Test extended memory found. Bank and failing bit displayed by the hex code.

RTC Test

Test the RTC portion of the CMOS chip.

Keyboard Controller

Test keyboard controller; initialise k/b if no errors.

Floppy Disk

Test and initialise floppy controllers and drives found; check specific errors with the displayed hex code. Check for correct setup or defective CMOS chip or battery.

Maths Copro

Test NPU registers and interrupt request functions.

CPU Clock Test

Test interface between CPU and system at different speeds. Check for incorrect clock setting for system peripherals or a bad CPU or clock generator chip.

Serial/Parallel Test

Test and initialise serial/parallel ports. Failure here will not halt the POST. The Vectra RS BIOS does not test the parallel port.

Boot

Initialise the BIOS vector table; standard and extended CMOS data areas and any adapter ROMs present. Then call Int 19 and give control to the boot loader. Failures past this point are usually down to the hard drive or corrupt OS code.

HP POST Codes

Code

Meaning

01

LED test

02

Processor test

03

System (BIOS) ROM test

04

RAM refresh timer test

05

Interrupt RAM test

06

Shadow the System ROM BIOS

07

CMOS RAM test

08

Internal cache memory test

09

Initialize the Video Card

10

Test external cache

11

Shadow option ROMs

12

Memory Subsystem test

13

Initialize EISA/ISA hardware

14

8042 self-test

15

Timer 0/Timer 2 test

16

DMA Subsystem test

17

Interrupt controller test

18

RAM address line independence test

19

Size extended memory

20

Real-Mode memory test (first 640K)

21

Shadow RAM test

22

Protect Mode RAM test (extended RAM)

23

Real Time clock test

24

Keyboard test

25

Mouse test

26

Hard disk test

27

LAN test

28

Flexible disk controller subsystem test

29

Internal numeric coprocessor test

30

Weitek coprocessor test

31

Clock speed switching test

32

Serial Port test

33

Parallel Port test

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