BiosCentral - HP BIOS Post Codes

HP BIOS Post Procedures
HP Vectra BIOS Post Codes
HP Vectra ES BIOS Post Codes
HP Vectra QS & RS BIOS Post Codes
HP Pavilion Series 3100 & 8000 BIOS Post Codes

HP BIOS Post Procedures:

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. Initialize 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	The the CPU cache controller and memory
Video Adapter	Initialize the video adapter. If EGA.VGA is present, wait for the adapter to finish internal diagnostics. Check for adapter or improper setup if a failure occurs
DMA Test	Bit patterns written to all DMA controller registers, including page registers, and verifies the patterns written. If the tests pass the registers are reset and the controller initialized
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 also
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 area. Perform a register test and check byte 0D to determine power status. Check the CMOS extended CMOS RAM or battery respectively if a failure occurs
Manufacturing Loop	Search for diagnostic tool used in manufacturing and run predetermined tests if found. Otherwise continue POST
Base Memory Test	Test RAM between 64K and 640K with several pattern test. The bit failure and bank can be determined by the displayed hex code
Extended 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. Initialize keyboard if no errors found
Floppy Disk	Test and initialize floppy controllers and drives found. Check specific errors with the displayed hex code. Check for correct setup or defective CMOS chip or defective battery
Math Coprocessor	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 and Parallel Test	Test and initialize serial and parallel ports. Failure here will not halt the POST. The Vectra RS BIOS does not test the parallel port
Boot	Initialize the BIOS vector table, standard and extended CMOS data areas and any adapter ROM's present. Then call Int 19 boot loader and give control to it. Failures past this point usually point to the hard drive or corrupt bootloader code

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HP Vectra BIOS Post Codes:

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 ROM's
12	Memory subsystem test
13	Initialize EISA/ISA hardware
14	8042 keyboard controller 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	Protected 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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HP Vectra ES BIOS Post Codes:

000F	80286 CPU is bad
0010	Bad checksum on ROM 0
0011	Bad checksum on ROM 1
011X	One of the RTC registers is bad; Register = x(0-D)
0120	RTC failed to tick
0240	CMOS/RTC has lost power
0241	Invalid checksum, IBM CMOS area
0280	Invalid checksum, HP CMOS area
02XY	One of the CMOS registers is bad; Register = XY - 40
0301	8042 failed to accept the reset command
0302	8042 failed to respond to the reset command
0303	8042 failed to reset
0311	8042 failed to accept the "WRITE CMD BYTE" command
0312	8042 failed to accept the data of the above command
0321	8042 failed to accept scancode from port 68
0322	8042 failed to respond to the above scancode
0323	8042 responded incorrectly to the above scancode
0331	8042 failed to accept command from port 6A
0332	8042 failed to generate SVC on port 67
0333	8042 generated HPINT type on port 65
0334	8042 failed the R/W register on port 69
0335	8042 failed to generate HPINT on IRQ 15
0336	8042 failed to generate HPINT on IRQ 12
0337	8042 failed to generate HPINT on IRQ 11
0338	8042 failed to generate HPINT on IRQ 10
0339	8042 failed to generate HPINT on IRQ 7
033A	8042 failed to generate HPINT on IRQ 5
033B	8042 failed to generate HPINT on IRQ 4
033C	8042 failed to generate HPINT on IRQ 3
0341	8042 failed keyboard interface test command
0342	8042didn't respond to interface command
0343	Keyboard clock line stuck low
0344	Keyboard clock line stuck high
0345	Keyboard data line stuck low
0346	Keyboard data line stuck high
0350	No ACK from keyboard self test command
0351	Bad ACK from keyboard self test command
0352	Keyboard is dead or not connected
0353	No result from keyboard self test command
0354	Keyboard self test failed
0401	8042 failed to enable gate A-20
0503	Serial port dead or non existent
0505	Serial port fails port register tests
0543	Parallel port dead or non-existent
06XX	Stuck key; XX=scancode of key
0700	Failed to switch to slow mode
0701	Failed to switch to dynamic mode
0702	Timer (channel 0) failed to interrupt
0703	Memory cycles too slow in slow mode
0704	Memory cycles too fast in slow mode
0705	I/O cycles too slow in slow mode
0706	I/O cycles too fast in slow mode
0707	Memory cycles too slow in dynamic mode
0708	Memory cycles too fast in dynamic mode
0709	I/O cycles too slow in dynamic mode
070A	I/O cycles too fast in dynamic mode
110X	One of the timer channels failed to register test / X(0-2)=channel that failed
1200	Memory refresh signal stuck high
1201	Memory refresh signal stuck low
211X	DMA 1 failed R/W test at register x (0-7)
212X	DMA 2 failed R/W test at register x (0-7)
221X	Bad DMA page register; X=register 0-7
300X	HP-HIL controller failed self test; X=data
	X = xx1 = >read/write fail with data = 0DA5h
	X = xx1x = >read/write fail with data = 0DA5h
	X = x1xx = >read/write fail with data = 0DA5h
	X = 1xxx = >read/write fail with data = 0DA5h
3010	HP-HIL device test failed
4XYZ	Lower 640K failed R/W test;
	X=0,2,4,6 Y>0=Bad U23 Z>0=Bad U13
	X=1,3,5,7 Y>0=Bad U43 Z>0=Bad U33
	X=8 Y>0=Bad U22 Z>0=Bad U12
	X=9 Y>0=Bad U42 Z>0=Bad U32
5XYZ	Lower 640K failed marching ones test
	X = bbbx = > bbb (0-7) is # of 128K bank
	bbb0 = > Indicate even byte bad
	bbb1 = > Indicate odd byte bad
	YZ = bbbb bbbb = > Bits for which b = 1 are bad
61XY	RAM address line XY stuck
	Some address lines to RAM are stuck to 0 or 1
	XY = 00bb bbbb = > RAM address line bbbbbb is stuck
	XY = 01bb bbbb = > Multiple address lines are stuck (bbbbbb is the first bad one)
620X	Lower 640K parity error; Bank X
	X = Address in 64K bank where parity error occurred
	if X = 0 to y, U21 and/or U31 is/are bad
	if X = 8 to 9, U11 and/ore U41 is/are bad
63XY	Parity error above 1MB; Bank XY
	Parity error has occurred during RAM test above the first MB
	XY = Address in 64K bank where parity occurred
6400	Parity generator failed to detect error
71XY	Master 8259 failed R/W; bits XY
	XY = bbbb bbbb + > bits in which b = 1 is bad
72XY	Slave 8259 failed R/W; bits XY
	XY = bbbb bbbb = > bits in which b = 1 is bad
7400	Master 8259 failed interrupt
7500	Slave 8259 failed interrupt
9XYZ	Floppy drive controller error
	X=drive #
	Y=0=1st level error
	Z=0 Unsuccessful input from FD
	Z=1 Unsuccessful output to FDC
	Z=2 Error while executing seek
	Z=3 Error during recalibrate
	Z=4 Error verifying RAM buffer
	Z=5 Error while resetting FDC
	Z=6 Wrong drive identified
	Z=7 Wrong media identified
	Z=8 No interrupt from FDC
	Z=9 Failed to detect track 0
	Z=A Failed to detect index pulse
	Y>1=Higher level error
	Y=1=Read sector error, side 0
	Y=2=Read sector error, side 1
	Y=3=Write sector error, side 0
	Y=4=Write sector error, side 1
	Y=5=Format sector error, side 0
	Y=6=Format sector error, side 1
	Y=7=Read ID error, side 0
	Y=8=Read ID error, side 1
	Z=1=No ID address mark
	Z=2=No data address mark
	Z=3=Media is write protected
	Z=4=Sector # wrong
	Z=5=Cylinder # wrong
	Z=6=Bad cylinder
	Z=7=DMA overrun
	Z=8=ID CRC error
	Z=9=Data CRC error
	Z=A=End of cylinder
	Z=B=Unrecognizable error
A001	No 80287 detected
A002	80287 failed stack register R/W test
A00C	No zero-divide interrupt from 80287
CXYZ	R/W error on extended RAM in XY bank
	Read/Write test failure on extended RAM
	X = 0 = > Even byte is bad
	X = 1 = > Odd byte is bad
	XY = Address in 64K bank where RAM failed
CFFF	Extended RAM marching ones failed
	Marching on test failure on extended RAM
	X = 0 = > Even byte bad
	X = 1 = > Odd byte bad
	XA = Address in 64K bank where RAM failed

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HP Vectra QS & RS BIOS Post Codes:

000F	386 CPU bad
0010	Bad checksum on ROM 0
0011	Bad checksum on ROM 1
011X	RTC register is bad
0120	RTC failed to tick
0240	CMOS/RTC lost power
0241	Invalid checksum, IBM CMOS area
0280	Invalid checksum, HP CMOS area
02XY	Bad CMOS register, at XY-40
0301	8042 failed to accept reset command
0302	8042 failed to respond to reset
0303	8042 failed on reset
0311	8042 didn't accept "WRITE CMD BYTE"
0312	8042 didn't accept data
0321	8042 failed to accept scancode, port 68
0322	8042 failed to respond to the above scancode
0323	8042 responded incorrectly to the above scancode
0331	8042 failed to accept command from port 6A
0332	8042 failed to generate SVC on port 67
0333	8042 generated HPINT type on port 65
0334	8042 failed the R/W register on port 69
0335	8042 failed to generate HPINT on IRQ 15
0336	8042 failed to generate HPINT on IRQ 12
0337	8042 failed to generate HPINT on IRQ 11
0338	8042 failed to generate HPINT on IRQ 10
0339	8042 failed to generate HPINT on IRQ 7
033A	8042 failed to generate HPINT on IRQ 5
033B	8042 failed to generate HPINT on IRQ 4
033C	8042 failed to generate HPINT on IRQ 3
0341	8042 failed keyboard interface test command
0342	8042didn't respond to interface command
0343	Keyboard clock line stuck low
0344	Keyboard clock line stuck high
0345	Keyboard data line stuck low
0346	Keyboard data line stuck high
0350	No ACK from keyboard self test command
0351	Bad ACK from keyboard self test command
0352	Keyboard is dead or not connected
0353	No result from keyboard self test command
0354	Keyboard self test failed
0401	8042 failed to enable gate A-20
0503	Serial port dead or non-existent
0505	Serial port fails port register tests
06XX	Stuck key; XX=scancode of key
0700	Failed to switch to slow speed
0701	Failed to switch to fast speed
0702	Timer failed to interrupt
0703	CPU clock too slow in slow speed
0704	CPU clock too fast in slow speed
0707	CPU clock too slow in fast speed
0708	CPU clock too fast in fast speed
0709	Failed to switch bus clock to ATCLK
110X	Timer X (0-2) failed to register test
1200	Memory refresh signal stuck high
1201	Memory refresh signal stuck low
211X	DMA 1 failed R/W test at register x (0-7)
212X	DMA 2 failed R/W test at register x (0-7)
221X	Bad DMA page register; X=register 0-7
300X	HP-HIL controller failed self test; X=data
	X = xxx1 = > read/write fail with data = 0DA5Ah
	X = xx1x = > read/write fail with data = 0DA5Ah
	X = x1xx = > read/write fail with data = 0DA5Ah
	X = 1xxx = > read/write fail with data = 0DA5Ah
3010	HP-HIL device test failed
4XYZ	Lower 640K failed R/W test;
	X=0,2,4,6 Y>0=Bad U23 Z>0=Bad U13
	X=1,3,5,7 Y>0=Bad U43 Z>0=Bad U33
	X=8 Y>0=Bad U22 Z>0=Bad U12
	X=9 Y>0=Bad U42 Z>0=Bad U32
5XYZ	Lower 640K failed marching ones test
	RAM in lower 640K failed read/write test
	X = bbcc = > bb is # 64K of 32 bit word bank
	cc = 00 = > byte 0 is bad
	cc = 01 = > byte 1 is bad
	cc = 02 = > byte 2 is bad
	cc = 03 = > byte 3 is bad
	YZ = bbbb bbbb = > bits for which b = 1 are bad
61XY	RAM address line XY stuck
	Some address lines to RAM are stuck to 0 or 1
	XY = 00bb bbbb = > RAM address line bbbbbb is stuck
	XY = 01bb bbbb = > Multiple address lines are stuck bbbbbb is the first bad one
620X	Lower 640K parity error; Bank X
	X = Address in 64K bank where parity occurred
63XY	Parity error above 1MB; Bank XY
	XY = Address in 64K bank where parity occurred
6500	Shadow RAM bad at BIOS segment
6510	Shadow RAM bad at HP EGA segment
71XY	Master 8259 failed R/W; bits XY
	XY = bbbb bbbb = > bits which b = 1 is bad
72XY	Slave 8259 failed R/W; bits XY
	XY = bbbb bbbb = > bits which b = 1 is bad
7400	Master 8259 failed interrupt
7500	Slave 8259 failed interrupt
9XYZ	Floppy drive controller error
	X=drive #
	Y=0=1st level error
	Z=0 Unsuccessful input from FD
	Z=1 Unsuccessful output to FDC
	Z=2 Error while executing seek
	Z=3 Error during recalibrate
	Z=4 Error verifying RAM buffer
	Z=5 Error while resetting FDC
	Z=6 Wrong drive identified
	Z=7 Wrong media identified
	Z=8 No interrupt from FDC
	Z=9 Failed to detect track 0
	Z=A Failed to detect index pulse
	Y>1=Higher level error
	Y=1=Read sector error, side 0
	Y=2=Read sector error, side 1
	Y=3=Write sector error, side 0
	Y=4=Write sector error, side 1
	Y=5=Format sector error, side 0
	Y=6=Format sector error, side 1
	Y=7=Read ID error, side 0
	Y=8=Read ID error, side 1
	Z=1=No ID address mark
	Z=2=No data address mark
	Z=3=Media is write protected
	Z=4=Sector # wrong
	Z=5=Cylinder # wrong
	Z=6=Bad cylinder
	Z=7=DMA overrun
	Z=8=ID CRC error
	Z=9=Data CRC error
	Z=A=End of cylinder
	Z=B=Unrecognizable error
A001	No 80287 detected
A002	80287 failed stack register R/W test
A00C	No zero-divide interrupt from 80287
AF00	Weitek coprocessor didn't enter protected mode
AF01	Weitek coprocessor nor present
AF02	Weitek coprocessor fails register test
AF05	Weitek coprocessor fails addition test
AF06	Weitek coprocessor fails interrupt test
AF0C	Weitek coprocessor fails interrupt test
CXYZ	R/W error on extended RAM in XY bank
	X = 0 = > Even byte bad
	X = 1 = > Odd byte bad
	XY = Address in 64K bank where RAM failed
CFFF	No extended RAM found
EXYZ	Extended RAM marching ones failure at XYZ
	X = 0 = > Byte 0 is bad
	X = 1 = > Byte 1 is bad
	X = 2 = > Byte 2 is bad
	X = 3 = > Byte 3 is bad

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HP Pavilion Series 3100 & 8000 BIOS Post Codes:

02	Verify real mode
03	Disable NMI
04	Get processor type
06	Initialize system hardware
08	Initialize chipset with POST values
09	Set IN-POST flags
0A	Initialize CPU registers
0B	Enable CPU registers
0C	Initialize cache to POST values
0E	Initialize I/O component
0F	Initialize local IDE bus
10	Initialize power management
11	Load alternate registers
12	Restore CPU control word during warm boot
13	Initialize PCI bus mastering devices
14	Initialize keyboard controller
16	BIOS ROM checksum
17	Initialize cache before memory size
18	Initialize 8254 timer
1A	Initialize DMA controller
1C	Reset PIC
20	Test DRAM refresh
22	Test 8742 keyboard controller
24	Set ES segment register to 4GB
26	Enable A-20 line
28	Autosize DRAM
29	Initialize POST memory manager
2A	Clear 512K base RAM
2C	RAM address line failure
2E	RAM data failure, low byte
2F	Enable cache before BIOS shadow
30	RAM data failure, high byte
32	Test CPU, BUS clock frequency
33	Initialize POST dispatch manager
34	Test CMOS RAM
35	Initialize alternate chipset registers
36	Warm start shut-down
37	Reinitialize chipset (MB only)
38	Shadow system BIOS ROM
39	Reinitialize cache (MB only)
3A	Autosize cache
3C	Configure advanced chipset registers
3D	Load alternate registers new CMOS values
40	Set initial CPU speed
42	Initialize interrupts
44	Initialize BIOS interrupts
45	POST device initialization
46	Check ROM copyright notice
47	Initialize manager for PCI option ROM's
48	Check video config against CMOS
49	Initialize manager for PCI option ROM's
4A	Initialize all video adapters
4B	Display quiet boot screen
4C	Shadow video BIOS
4E	Display BIOS copyright notice
50	Display CPU type & speed
51	Initialize
52	Test keyboard
54	Set key click if enabled
56	Enable keyboard
58	Test for unexpected interrupts
59	Initialize POST display service
5A	Display "Press F2 to Enter Setup"
5B	Disable CPU cache
5C	Test RAM, 512-640K
60	Test extended memory
62	Test extended memory address lines
64	Jump to user patch 1
66	Configure advanced cache registers
67	Initialize multi-processor APIC
68	Enable external & processor caches
69	Set up SMM area
6A	Display external L2 cache size
6C	Display shadow area message
6E	Display high address for UMB recovery
70	Display error message
72	Check for configuration errors
74	Test real time clock
76	Check for keyboard errors
7A	Test for key lock on
7C	Set up hardware interrupt vectors
7E	Initialize coprocessor, if present
80	Disable onboard super I/O ports
81	Late POST device initialization
82	Detect & install external RS-232 ports
83	Configure non-MDC IDE controllers
84	Detect & install external parallel ports
85	Initialize PnP ISA devices
86	Reinitialize onboard I/O ports
87	Configure motherboard configurable devices
88	Initialize BIOS data area
89	Enable NMI's
8A	Initialize extended BIOS data area
8B	Test & initialize PS/2 mouse
8C	Initialize floppy controller
8F	Determine number of ATA drives
90	Initialize hard disk controllers
91	Initialize local BUS HD controllers
92	Jump to user patch 2
93	Build MPTABLE for multiprocessor boards
94	Disable A-20 line
95	Install CD-ROM for boot
96	Clear huge ES segment register
97	Fix up multiprocessor table
98	Search for options ROM's
99	Check for smart drive
9A	Shadow ROM option
9C	Set up power management
9E	Enable hardware interrupts
9F	Determine number of ATA & SCSI drives
A0	Set time of day
A2	Check key lock
A4	Initialize typematic rate
A8	Erase F2 prompt
AA	Scan for F2 keystroke
AC	Enter SETUP
AE	Clear IN-POST flag
B0	Check for errors
B2	POST done, prepare for boot
B4	One short beep before boot
B5	Terminate quiet boot
B6	Check password (optional)
B8	Clear global descriptor table
B9	Clean up all graphics
BA	Initialize DMI parameters
BB	Initialize PnP option ROM's
BC	Clear parity checkers
BD	Display multi boot menu
BE	Clear screen optional
BF	Check virus and backup reminders
C0	Try to boot with Int 19
C1	Initialize POST error manager
C2	Initialize error logging
C3	Initialize error display function
C4	Initialize system error handler
E0	Initialize the chipset
E1	Initialize the bridge
E2	Initialize the processor
E3	Initialize system timer
E4	Initialize system I/O
E5	Check force recovery boot
E6	Checksum BIOS ROM
E7	Got to BIOS
E8	Set huge segment
E9	Initialize multiprocessor
EA	Initialize OEM special code
EB	Initialize PIC & DMA
EC	Initialize memory type
ED	Initialize memory type
EE	Shadow boot block
EF	System memory test
F0	Initialize interrupt vectors
F1	Initialize runtime clock
F2	Initialize video
F3	Initialize beeper
F4	Initialize BOOT
F5	Clear huge segment
F6	Boot to mini-DOS
F7	Boot to full DOS

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All information has been gathered with permission of the respective BIOS providers. Although Bios Central has used reasonable effort to ensure accuracy we are unable to verify all codes posted. Use at your own risk. Bios Central, or any person associated with Bios Central takes no responsibility for any dmage resulting from the use of this information.