Compaq BIOS Post Codes - BIOS Central

Compaq General BIOS Post Codes
Compaq 286 Deskpro BIOS Post Codes
Compaq 386 Deskpro BIOS Post Codes
Compaq 486 Deskpro BIOS Post Codes
Compag Video BIOS Post Codes
Compaq System POST Messages

Compaq General BIOS Post Codes:

00	Initialize flags, MSW,IDTLIN
01	Read manufacturing jumper
02	8042 received read command
03	No response from 8042
04	Look for ROM at E000
05	Look for ROM at C800
06	Normal CMOS reset code
08	Initialize 8259,80287
09	Reset code in CMOS byte
0A	Vector vis 40:67 reset function
0B	Vector vis 40:67 with E01 function
0C	Boot reset function
0D	Test #2 8254 PIT counter 0
0E	Test #2 8254 PIT counter 2
0F	Warm boot
10	PPI disabled, test 8254 PIT's 0 and 1
11	Initialize (blast) VDU controller
12	Clear screen; turn ON video
13	Test time 0
14	Disable RTC interrupts
15	Check battery power
16	Battery has lost power
17	Clear CMOS Diags.
18	Test base memory (First 128K)
19	Initialize base memory
1A	Initialize VDU adapters
1B	The system ROM
1C	CMOS checksum
1D	DMA controller/page registers
1E	Test keyboard controller
1F	Test 286 protected mode
20	Test real and extended memory
21	Initialize time-of-day
22	Initialize 287 coprocessor
23	Test the keyboard and 8042
24	Reset A20, set default CPU speed
25	Test diskette subsystem
26	Test fixed disk subsystem
27	Initialize parallel printer
28	Perform search for optional ROM's
29	Test valid system configuration
2A	Clear screen
2B	Check for invalid time and date
2C	Optional ROM search
2D	Test timer 2
2F	Write to diagnostic byte
30	Clear first 128K bytes of RAM
31	Load interrupt vectors 70-77
32	Load interrupt vectors 00-1F
33	Initialize MEMSIZE and RESETWD
34	Verify CMOS checksum
35	CMOS checksum is not valid
36	Check battery power
37	Check for game adapters
38	Check for Serial ports
39	Check for parallel printer ports
3A	Initialize port and comm time-outs
3B	Flush keyboard buffer
40	Save RESETWD value
41	Check RAM refresh
42	Start write of 128K RAM test
43	Reset parity checks
44	Start verify of 128K RAM test
45	Check for parity errors
46	NO RAM errors
47	RAM error detected
50	Check for dual frequency in CMOS
51	Check CMOS VDU configuration
52	Start VDU ROM search
53	Vector to VDU option ROM's
54	Initialize first display adapter
55	Initialize second display adapter
56	No display adapters installed
57	Initialize primary VDU mode
58	Start of VDU test (each adapter)
59	Check existence of adapter
5A	Check VDU registers
5B	Start screen memory test
5C	End test of adapter, clear memory
5D	Error detected on an adapter
5E	Test the next adapter
5F	All adapters successfully tested
60	Start of memory tests
61	Enter protected mode
62	Start memory sizing
63	Get CMOS size
64	Start test of real memory
65	Start test of extended memory
66	Save size memory (base, ext)
67	128K-option installed CMOS bit
68	Prepare to return to real mode
69	Back in real mode-successful
6A	Protected mode error during test
6B	Display error message
6C	End of memory test
6D	Initialize KB OK string
6E	Determine size to test
6F	Start MEMTEST
70	Display XXXXXKB OK
71	Test each RAM segment
72	High order address test
73	Exit MEMTEST
74	Parity error on bus
75	Start protected mode test
76	Prepare to enter protected mode
77	Test software exceptions
78	Prepare to return to real mode
79	Back in real mode-successful
7A	Back in real mode-error occurred
7B	Exit protected mode
7C	High order address test failure
7D	Entered cache controller test
7E	Programming memory cache
7F	Copy system ROM to high RAM
80	Start of 8042 test
81	Do 8042 self test
82	Check result received
83	Error result
84	OK 8042, Init mode=5D
86	Start test, reset keyboard
87	Got acknowledge, read result
88	Got result, check it
89	Test for stuck keys
8B	Test keyboard interface
8A	Key seems to be stuck
8C	Got result, check it
8D	End of test, no errors
90	Start of CMOS test
91	CMOS seems to be OK
92	Error on CMOS read,write test
93	Start of DMA controller test
94	Page registers seem to be OK
95	DMA controller is OK
96	8237 initialization is complete
97	Start of NCA RAM test
A0	Start of diskette tests
A1	FDC reset active (3F2h Bit 2)
A2	FDC reset inactive (3F2h Bit 2)
A3	FDC motor on
A4	FDC time-out error
A5	FDC failed reset
A6	FDC passed reset
A8	Start to determine drive type
A9	Seek operation initialized
AA	Waiting for FDC seek status
AF	Diskette tests complete
B0	Start of fixed drive tests
B1	Combo board not found-exit
B2	Combo controller failed-exit
B3	Testing drive 1
B4	Testing drive 2
B5	Drive error (error condition)
B6	Drive failed (failed to respond)
B7	No fixed drives-exit
B8	Fixed drive tests complete
B9	Attempt to boot diskette
BA	Attempt to boot fixed drive
BB	Boot attempt failed FD/HD
BC	Jump to boot record
BD	Drive error, retry booting
BE	Weitek coprocessor test
D0	Entry to clear memory routine
D1	Ready to go to protected mode
D2	Ready to clear extended memory
D3	Ready to reset back to real mode
D4	Back in real mode
D5	Clear base memory
DD	Built-in self-test failed
E0	Ready to replace E000 ROM
E1	Completed E000 ROM replacement
E2	Ready to replace EGA ROM
E3	Completes EGA ROM replacement

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Compaq 286 Deskpro BIOS Post Codes:

01	Central processing unit
02	Coprocessor
02	Direct memory access
04	Interrupt controller
05	Port 61
06	Keyboard controller
07	CMOS
08	CMOS
09	CMOS
10	Programmable timer
11	Refresh detect test
12	Speed test
14	Speaker test
21	Memory read/write
24	Memory address
25	Walking I/O
31	Keyboard short test
32	Keyboard long test
33	Keyboard LED test
35	Security lock test
41	Printer failed
42	Printer date, interrupt
43	Printer pattern test
48	Printer failed
51	VDU controller test
52	VDU controller test
53	VDU attribute test
54	VDU character set test
55	VDU 80 x 25 mode
56	VDU 80 x 25 mode
57	VDU 40 x 25 mode
60	Diskette drive ID test
61	Format
62	Read test
63	Write/read compare test
64	Random seek
65	ID media test
66	Speed test
67	Wrap test
68	Write protect test
69	Reset controller test

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Compaq 386 Deskpro BIOS Post Codes:

01	I/O ROM error
02	System memory board failure
12	System option error
13	Time and date not set
14	Memory size error
21	Memory error
23	Memory address error
25	Memory error
26	Keyboard error
33	Keyboard controller error
34	Keyboard or system unit error
41	Printer error
42	Monochrome adapter failure
51	Display adapter failure
61	Diskette controller failure
62	Diskette boot recorder error
65	Ext. FDC failed got to internal F
6A	Floppy port address conflict
6B	Floppy port address conflict
72	Coprocessor detection

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Compaq 486 Deskpro BIOS Post Codes:

01	CPU test failed
02	Coprocessor or Weitek error
03	DMA page registers
04	Interrupt controller master
05	Port 61 error
06	Keyboard controller self test
07	CMOS RAM test failed
08	CMOS interrupt test failed
09	CMOS clock load data test
10	Programmable timer
11	Refresh detect test failed
12	Speed test slow mode out of range
13	Protected mode test failed
14	Speaker test failed
16	Cache memory configuration
19	Installed devices test
21	Memory machine ID test failed
22	Memory system ROM checksum
23	Memory read/write test failed
24	Memory address test failed
25	Walking I/O test failed
26	Increment pattern test failed
31	Keyboard short test, 8042
32	Keyboard long test failed
33	Keyboard LED test, 8042
34	Keyboard typematic test failed
41	Printer failed or not connected
42	Printer data register failed
43	Printer pattern test
48	Printer not connected
51	Video controller test failed
52	Video memory test failed
53	Video attribute test failed
54	Video character set test failed
55	Video 80 x 25 mode
56	Video 80 x 25 mode
57	Video 40 x 25 mode test failed
58	Video 320 x 200 mode color set 1
59	Video 320 x 200 mode color set 1
60	Diskette ID drive types test
61	Diskette format failed
62	Diskette read test failed
63	Diskette write, read, random seek
65	Diskette media ID failed
66	Diskette speed test failed
67	Diskette wrap test failed
68	Diskette write protect test
69	Diskette reset controller test
82	Video memory test failed
84	Video adapter test failed

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Compaq Video BIOS Post Codes:

00	Entry into video ROM
01	Test alternate adapters
02	Perform vertical sync tests
03	Perform horizontal sync tests
04	Perform static system tests
05	Perform bug tests
06	Peform configuration tests
07	Perform alternate ROM tests
08	Run color gun off tests
09	Run color gun on tests
0A	Test video memory
0B	Check that adapter board is present
10	Error...illegal configuration
20	Error...no vertical sync present
21	Error...vertical sync out of range
30	Error...no horizontal sync present
40	Error...color register failure
50	Error...slot type conflict failure
51	Error...video memory conflict error
52	Error...ROM conflict error
60	Error...red DAC stuck low
61	Error...green DAC stuck low
62	Error...blue DAC stuck low
63	Error...DAC stuck high
64	Error...red DAC fault
65	Error...green DAC fault
66	Error...blue DAC fault
70	Error...bad alternate ROM version
80	Error...color gun stuck on
90	Error...color gun stuck off
A0	Error...video memory failure
F0	Error...equipment failure
00	Video POSY complete

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Compaq System Post Messages:

101	Option ROM Error
102	System board failure
103	System board failure
162	System options not set
163	Time and date not set
164	Memory size error
183	Invalid processor jumper setting
201	Memory error
202	Memory type mismatch
207	ECC corrected single bit errors in DIMM/SIMM pair(s)
213	Incompatible DIMM module in DIMM socket(s)
301	Keyboard error
304	Keyboard or system unit error
401	Parallel port 1 address assignment conflict
403	Parallel port 3 address assignment conflict
404	Parallel port address conflict detected
410	Audio interrupt conflict
411	Network interface card interrupt conflict
501	Display adapter failure
601	Diskette controller error
602	Diskette boot record error
605	Diskette drive type error
610	External storage device failure
611	Primary floppy port address assignment conflict
612	Secondary floppy port address assignment conflict
660	Display cache is detected unreliable
912	Computer cover has been removed since last system startup
914	Hood lock coil is not connected
916	thermal sensor from processor heatsink is not connected
917	Expansion riser not detected
1151	Serial port 1 address conflict detected
1152	Serial port 2 address conflict detected
1155	Serial port address detected
1201	System audio address conflict detected
1202	MIDI port address conflict detected
1203	Game port address conflict detected
1720	SMART hard drive detects imminent failure
1721	SMART SCSI hard drive detects imminent failure
1771	Primary disk port address assignment conflict
1772	Secondary disk port address assignment conflict
1780	Disk 0 failure
1781	Disk 1 failure
1782	Disk controller failure
1790	Disk 0 failure
1791	Disk 1 failure
1792	Secondary disk controller failure
1793	Secondary controller or disk failure
1800	Temperature alert
1801	Processor not supported by ROM BIOS

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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.