The complete BIOS beep guide

The complete BIOS beep Guide- AST mobos

[CENTER]AST BIOS[/CENTER]


Beeps Error Description

1 short CPU register test failure- The CPU has failed

2 short Keyboard controller buffer failure- The keyboard controller has failed

3 short Keyboard controller reset failure- The keyboard controller has failed or the motherboard circuitry is faulty

4 short Keyboard communication failure- Either the keyboard controller IC or the associated circuitry has failed. replace the keyboard first, then is still faulty, replace the keyboard controller IC

5 short Keyboard input failure- The keyboard controller IC has failed. Replace the IC

6 short System board chipset failure- The chipset on the motherboard has failed. Replace the motherboard.

9 short BIOS ROM checksum error- The BIOS ROM has failed. If possible, replace the BIOS on the motherboard

10 short System timer test failure- The system clock IC has failed. CMOS Battery might require replacement.

11 short ASIC failure- Motherboard circuitry has failed. Replace the motherboard

12 short CMOS RAM shutdown register failure- THE real time clock/CMOS IC failed. Replace the CMOS or motherboard

1 long DMA controller 0 failure- The DMA controller IC for channel 0 has failed. If possible, replace the IC

1 long, 1 short DMA controller 1 failure- The DMA controller IC for channel 1 has failed. If possible, replace the IC

1 long, 2 short Video vertical retrace failure- The video adapter has probably failed. Replace the video adapter

1 long, 3 short Video memory test failure- The video adapter's memory has failed. Replace the video adapter

1 long, 4 short Video adapter failure- The video adapter has failed. Replace the video adapter

1 long, 5 short 64KB memory failure- A failure has occurred in the base 64KB of memory. If possible, replace the RAM IC

1 long, 6 short Unable to load interrupt vectors- The BIOS was unable to load the interrupt vectors into memory

1 long, 7 short Unable to initialize video- This a video problem. Replace the video adapter first. If problem is still present, replace the motherboard

1 long, 8 short Video memory failure- The is a failure in the video memory. Replace the video adapter first. If problem is still present, replace the motherboard

The complete BIOS beep Guide- Compaq

[CENTER]FOR COMPAQ motherboards[/CENTER]

BEEPS ERROR DESCRIPTION

1 short No error- System is booting properly

1 long, 1 short BIOS ROM checksum error- The contents of the BIOS ROM to not match the expected contents. If possible, reload the BIOS from the PAQ

2 short General error- Unknown

1 long, 2 short Video error- Check the video adapter and ensure it's seated properly. If possible, replace the video adapter

7 beeps (1 long, 1s, 1l, 1 short, pause, 1 long, 1 short, 1 short
AGP video- The AGP video card is faulty. Reseat the card or replace it outright. This beep pertains to Compaq Deskpro systems

1 long never ending beep Memory error- Bad RAM. Replace and test

1 short, 2 long Bad RAM- Reseat RAM then retest; replace RAM if failure continues

The complete BIOS beep Guide- Mylex mobos

Beeps Error Description

1Beep Normal boot- System is booting normally

2 Beeps Video adapter error- The video adapter is either faulty or not seated properly. Check the adapter

3 Beeps Keyboard controller error- The keyboard controller IC is faulty. Replace the IC if possible

4 Beeps Keyboard error- The keyboard controller IC is faulty or the keyboard is faulty. Replace the keyboard, if problem still persists, replace the keyboard controller IC

5 Beeps PIC 0 error- The programmable interrupt controller is faulty. Replace the IC if possible

6 Beeps PIC 1 error- The programmable interrupt controller is faulty. replace the IC if possible

7 Beeps DMA page register error- The DMA controller IC is faulty. Replace the IC if possible

8 Beeps RAM refresh error- Replace RAM

9 Beeps RAM data error- Replace RAM

10 Beeps RAM parity error- Replace RAM

11 Beeps DMA controller 0 error- The DMA controller IC for channel 0 has failed

12 Beeps CMOS RAM error- The CMOS RAM has failed

13 Beeps DMA controller 1 error- The DMA controller IC for channel 1 has failed

14 Beeps CMOS RAM battery error- The CMOS RAM battery has failed. If possible, replace the CMOS or battery

15 Beeps CMOS RAM checksum error- The CMOS RAM has failed. If possible, replace the CMOS

16 Beeps BIOS ROM checksum error- The BIOS ROM has failed. If possible replace the BIOS or upgrade it

The complete BIOS beep Guide- Mylex 386 mobos

BEEPS ERROR DESCRIPTION
1 long Normal boot- System is booting normally

2 long Video adapter failure- Either the video adapter is faulty, not seated properly or is missing

1 long, 1 short, 1 long Keyboard controller error- Either the keyboard controller IC is faulty or the system board circuitry is faulty

1 long, 2 short, 1 long Keyboard error- Either the keyboard controller is faulty or the system board circuitry is faulty. Also check keyboard cable and pins

1 long, 3 short, 1 long PIC 0 error- The programmable interrupt controller IC is faulty

1 long 4 short, 1 long PIC 1 error- The programmable interrupt controller IC is faulty

1 long, 5 short, 1 long DMA page register error- The DMA controller IC 1 or 2 is faulty or the system board circuitry is faulty

1 long, 6 short, 1 long RAM refresh error- Replace RAM

1 long, 7 short, 1 long RAM data error- Replace RAM

1 long, 8 short, 1 long RAM parity error- Replace RAM

1 long, 9 short, 1 long DMA controller 1 error- The DMA controller for channel 0 is faulty or the system board circuitry is faulty

1 long, 10 short, 1 long CMOS RAM error- Either the CMOS RAM is faulty. Replace the CMOS.

1 long, 11 short, 1 long DMA controller 2 error- The DMA controller for channel 1 is faulty or the system board circuitry is faulty

1 long, 12 short, 1 long CMOS RAM battery error- The CMOS RAM battery is faulty or the CMOS RAM is bad. Replace the battery if possible

1 long, 13 short, 1 long CMOS checksum error- The CMOS RAM is faulty

1 long 14 short, 1 long BIOS ROM checksum failure-The BIOS ROM checksum is faulty. Replace the BIOS or upgrade

The complete BIOS beep Guide- Quadtel mobos

Beeps Error Messages Description
1 short Normal boot- System is booting normally

2 short CMOS IC error- The CMOS RAM is faulty. Replace the IC if possible

1 long, 2 short Video failure- The video adapter is faulty. Reseat the video adapter or replace the adapter if possible

1 long, 3 short Peripheral controller error- One or more of the system peripheral controllers is bad. Replace the controllers and retest

Phoenix ISA/MCA/EISA BIOS Beep Codes

Phoenix ISA/MCA/EISA BIOS Beep Codes:
The beep codes are represented in the number of beeps. E.g. 1-1-2 would mean 1 beep, a pause, 1 beep, a pause, and 2 beeps.
With a Dell computer, a 1-2 beep code can also indicate that a bootable add-in card is installed but no boot device is attached. For example, in you insert a Promise Ultra-66 card but do not connect a hard drive to it, you will get the beep code. I verified this with a SIIG (crap -- avoid like the plague) Ultra-66 card, and then confirmed the results with Dell. Credit to John Palmer.

Beeps Error Message Description
1-1-2 CPU test failure- The CPU is faulty. Replace the CPU
Low 1-1-2 System board select failure- The motherboard is having an undetermined fault. Replace the motherboard
1-1-3 CMOS read/write error- The real time clock/CMOS is faulty. Replace the CMOS if possible

Low 1-1-3 Extended CMOS RAM failure- The extended portion of the CMOS RAM has failed. Replace the CMOS if possible

1-1-4 BIOS ROM checksum error- The BIOS ROM has failed. Replace the BIOS or upgrade if possible

1-2-1 PIT failure- The programmable interrupt timer has failed. Replace if possible

1-2-2 DMA failure- The DMA controller has failed. Replace the IC if possible
1-2-3 DMA read/write failure- The DMA controller has failed. Replace the IC if possible
1-3-1 RAM refresh failure- The RAM refresh controller has failed
1-3-2 64KB RAM failure- The test of the first 64KB RAM has failed to start
1-3-3 First 64KB RAM failure- The first RAM IC has failed. Replace the IC if possible
1-3-4 First 64KB logic failure- The first RAM control logic has failed
1-4-1 Address line failure- The address line to the first 64KB RAM has failed
1-4-2 Parity RAM failure- The first RAM IC has failed. Replace if possible
1-4-3 EISA fail-safe timer test- Replace the motherboard
1-4-4 EISA NMI port 462 test- Replace the motherboard
2-1-1 64KB RAM failure
Bit 0; This data bit on the first RAM IC has failed. Replace the IC if possible
2-1-2 64KB RAM failure
Bit 1; This data bit on the first RAM IC has failed. Replace the IC if possible
2-1-3 64KB RAM failure
Bit 2; This data bit on the first RAM IC has failed. Replace the IC if possible
2-1-4 64KB RAM failure
Bit 3; This data bit on the first RAM IC has failed. Replace the IC if possible
2-2-1 64KB RAM failure
Bit 4; This data bit on the first RAM IC has failed. Replace the IC if possible
2-2-2 64KB RAM failure
Bit 5; This data bit on the first RAM IC has failed. Replace the IC if possible
2-2-364KB RAM failure
Bit 6; This data bit on the first RAM IC has failed. Replace the IC if possible
2-2-4 64KB RAM failure
Bit 7; This data bit on the first RAM IC has failed. Replace the IC if possible
2-3-1 64KB RAM failure
Bit 8; This data bit on the first RAM IC has failed. Replace the IC if possible
2-3-2 64KB RAM failure
Bit 9; This data bit on the first RAM IC has failed. Replace the IC if possible
2-3-3 64KB RAM failure
Bit 10; This data bit on the first RAM IC has failed. Replace the IC if possible
2-3-4 64KB RAM failure
Bit 11; This data bit on the first RAM IC has failed. Replace the IC if possible
2-4-1 64KB RAM failure
Bit 12; This data bit on the first RAM IC has failed. Replace the IC if possible
2-4-2 64KB RAM failure
Bit 13; This data bit on the first RAM IC has failed. Replace the IC if possible
2-4-3 64KB RAM failure
Bit 14; This data bit on the first RAM IC has failed. Replace the IC if possible
2-4-4 64KB RAM failure
Bit 15; This data bit on the first RAM IC has failed. Replace the IC if possible
3-1-1 Slave DMA register failure
The DMA controller has failed. Replace the controller if possible
3-1-2 Master DMA register failure
The DMA controller had failed. Replace the controller if possible
3-1-3 Master interrupt mask register failure- The interrupt controller IC has failed
3-1-4 Slave interrupt mask register failure- The interrupt controller IC has failed
3-2-2Interrupt vector error- The BIOS was unable to load the interrupt vectors into memory. Replace the motherboard
3-2-3 Reserved
3-2-4Keyboard controller failure- The keyboard controller has failed. Replace the IC if possible
3-3-1 CMOS RAM power bad- Replace the CMOS battery or CMOS RAM if possible
3-3-2 CMOS configuration error- The CMOS configuration has failed. Restore the configuration or replace the battery if possible
3-3-3Reserved
3-3-4 Video memory failure- There is a problem with the video memory. Replace the video adapter if possible
3-4-1 Video initialization failure- There is a problem with the video adapter. Reseat the adapter or replace the adapter if possible
4-2-1 Timer failure- The system's timer IC has failed. Replace the IC if possible
4-2-2 Shutdown failure- The CMOS has failed. Replace the CMOS IC if possible
4-2-3 Gate A20 failure- The keyboard controller has failed. Replace the IC if possible
4-2-4 Unexpected interrupt in protected mode- This is a CPU problem. Replace the CPU and retest
4-3-1 RAM test failure- System RAM addressing circuitry is faulty. Replace the motherboard
4-3-3 Interval timer channel 2 failure- The system timer IC has failed. Replace the IC if possible
4-3-4Time of day clock failure- The real time clock/CMOS has failed. Replace the CMOS if possible
4-4-1 Serial port failure- A error has occurred in the serial port circuitry
4-4-2 Parallel port failure- A error has occurred in the parallel port circuitry
4-4-3 Math coprocessor failure- The math coprocessor has failed. If possible, replace the MPU

part 2

Phoenix ISA/MCA/EISA BIOS Beep Codes - PART 2

Beeps Description
1-1-1-3Verify real mode
1-1-2-1Get CPU type
1-1-2-3Initialize system hardware
1-1-3-1Initialize chipset registers with initial values
1-1-3-2Set in POST flag
1-1-3-3Initialize CPU registers
1-1-4-1Initialize cache to initial values
1-1-4-3Initialize I/O
1-2-1-1Initialize power management
1-2-1-2Load alternative registers with initial POST values
1-2-1-3Jump to UserPatch0
1-2-2-1Initialize timer initialization
1-2-3-18254 timer initialization
1-2-3-38237 DMA controller initialization
1-2-4-1Reset Programmable Interrupt Controller
1-3-1-1Test DRAM refresh
1-3-1-3Test 8742 Keyboard Controller
1-3-2-1Set ES segment register to 4GB
1-3-3-1Autosize DRAM
1-3-3-3Clear 512K base memory
1-3-4-1Test 512K base address lines
1-3-4-3Test 51K base memory
1-4-1-3Test CPU bus-clock frequency
1-4-2-1CMOS RAM read/write failure (this commonly indicates a problem on the ISA bus such as a card not seated)
1-4-2-4Reinitialize the chipset
1-4-3-1Shadow system BIOS ROM
1-4-3-2Reinitialize the cache
1-4-3-3Autosize the cache
1-4-4-1Configure advanced chipset registers
1-4-4-2Load alternate registers with CMOS values
2-1-1-1Set initial CPU speed
2-1-1-3Initialize interrupt vectors
2-1-2-1Initialize BIOS interrupts
2-1-2-3Check ROM copyright notice
2-1-2-4Initialize manager for PCI Options ROMs
2-1-3-1Check video configuration against CMOS
2-1-3-2Initialize PCI bus and devices
2-1-3-3initialize all video adapters in system
2-1-4-1Shadow video BIOS ROM
2-1-4-3Display copyright notice
2-2-1-1Display CPU type and speed
2-2-1-3Test keyboard
2-2-2-1Set key click if enabled
2-2-2-3Enable keyboard
2-2-3-1Test for unexpected interrupts
2-2-3-3Display prompt "Press F2 to enter setup"
2-2-4-1Test RAM between 512K and 640K
2-3-1-1Test expanded memory
2-3-1-3Test extended memory address lines
2-3-2-1Jump to UserPatch1
2-3-2-3Enable external and CPU caches
2-3-2-3Configure advanced cache registers
2-3-3-1Enable external and CPU caches
2-3-3-2Initialize SMI handler
2-3-3-3Display external cache size
2-3-4-1Display shadow message
2-3-4-3Display non-disposable segments
2-4-1-1Display error messages
2-4-1-3Check for configuration errors
2-4-2-1Test real-time clock
2-4-2-3Check for keyboard errors
2-4-4-1Setup hardware interrupt vectors
2-4-4-3Test coprocessor if present
3-1-1-1Disable onboard I/O ports
3-1-1-3Detect and install external RS232 ports
3-1-2-1Detect and install external parallel ports
3-1-2-3Reinitialize onboard I/O ports
3-1-3-1Initialize BIOS Data Area
3-1-3-3Initialize Extended BIOS Data Area
3-1-4-1Initialize floppy controller
3-2-1-1Initialize hard disk controller
3-2-1-2Initialize local bus hard disk controller
3-2-1-3Jump to UserPatch2
3-2-2-1Disable A20 address line
3-2-2-3Clear huge ES segment register
3-2-3-1Search for option ROMs
3-2-3-3Shadow option ROMs
3-2-4-1Setup power management
3-2-4-3 Enable hardware interrupts
3-3-1-1 Set time of day
3-3-1-3 Check key lock
3-3-3-1 Erase F2 prompt
3-3-3-3 Scan for F2 keystroke
3-3-4-1 Enter SETUP
3-3-4-3 Clear in-POST flag
3-4-1-1 Check for errors
3-4-1-3 POST done - prepare to boot operating system
3-4-2-1 One beep
3-4-2-3 Check password (optional)
3-4-3-1 Clear global descriptor table
3-4-4-1 Clear parity checkers
3-4-4-3 Check virus and backup reminders
4-1-1-1 Try to boot with INT 19
4-2-1-1 Interrupt handler error
4-2-1-3 Unknown interrupt error
4-2-2-1 Pending interrupt error
4-2-2-3 Initialize option ROM error
4-2-3-1 Shutdown error
4-2-3-3 Extended Block Move
4-2-4-1 Shutdown 10 error
4-2-4-3 Keyboard Controller failure (most likely problem is with RAM or cache unless no video is present)
4-3-1-3 Initialize the chipset
4-3-1-4 Initialize refresh counter
4-3-2-1 Check for Forced Flash
4-3-2-2 BIOS ROM is OK
4-3-2-4 Do a complete RAM test
4-3-3-1 Do OEM initialization
4-3-3-2 Initialize interrupt controller
4-3-3-3 Read in bootstrap code
4-3-3-4 Initialize all vectors
4-3-4-2 Initialize the boot device
4-3-4-3 Boot code was read OK

IBM DIAGNOSTIC CODE DESCRIPTIONS


100 - 199 System Board
200 - 299 Memory
300 - 399 Keyboard
400 - 499 Monochrome Display
500 - 599 Color/Graphics Display
600 - 699 Floppy-disk drive and/or Adapter
700 - 799 Math Coprocessor
900 - 999 Parallel Printer Port
1000 - 1099 Alternate Printer Adapter
1100 - 1299 Asynchronous Communication Device, Adapter, or Port
1300 - 1399 Game Port
1400 - 1499 Color/Graphics Printer
1500 - 1599 Synchronous Communication Device, Adapter, or Port
1700 - 1799 Hard Drive and/or Adapter
1800 - 1899 Expansion Unit (XT)
2000 - 2199 Bisynchronous Communication Adapter
2400 - 2599 EGA system-board Video (MCA)
3000 - 3199 LAN Adapter
4800 - 4999 Internal Modem
7000 - 7099 Phoenix BIOS Chips
7300 - 7399 3.5" Disk Drive
8900 - 8999 MIDI Adapter
11200 - 11299 SCSI Adapter
21000 - 21099 SCSI Fixed Disk and Controller
21500 - 21599 SCSI CD-ROM System

MSI D-Bracket LED CODES

Note- some motherboards do not give an AUDIO alert for BIOS beep/ hardware failures. LED light flashes can provide indication. If so, consult your motherboard manual. For example, MSI motherboards equipped with a D-bracket will show the following:

*= lit
0 = unlit

**
**
System Power ON -The D-LED will hang here if the processor is damaged or not installed properly.

0*
**
Early Chipset Initialization

*0
**
Memory Detection Test- Testing onboard memory size. The D-LED will hang if the memory module is damaged or not installed properly

00
**
Decompressing BIOS image to RAM for fast booting

**
0*
Initializing Keyboard Controller

0*
0*
Testing VGA BIOS- This will start writing VGA sign-on message to the screen

*0
0*
Processor Initialization- This will show information regarding the processor (like brand name, system bus, etc...)

00
0*
Testing RTC (Real Time Clock)

**
*0
Initializing Video Interface- This will start detecting CPU clock, checking type of video onboard. Then, detect and initialize the video adapter

0*
*0
BIOS Sign On- This will start showing information about logo, processor brand name, etc...

*0
*0
Testing Base and Extended Memory- Testing base memory from 240K to 640K and extended memory above 1MB using various patterns

00
*0
Assign Resources to all ISA

**
00
Initializing Hard Drive Controller
- This will initialize IDE drive and controller

0*
00
Initializing Floppy Drive Controller- This will initializing Floppy Drive and controller

*0
00
Boot Attempt- This will set low stack and boot via INT 19h

00
00
Operating System Booting

Informative information...

Thanks for it and keep it up

Tedster, this is an amazing piece of work. You have made a contribution that will help all serious techs and meddlers. Thank you! Thank you !

Can we call it the Tedster Codes List? or something with your name attached.

RayBay

Very nice job....I commend you on the effort you put forth for the betterment of us all. Thank you
And yes I agree with raybay ,I think that that would be a good title for it.

I try to add guides periodically. Some are collections off the net, others are original compositions, some are a mix. You're all welcome.

Excellent work . If only all pc problems could have this sort of guide so much peoples time would be saved.

Excellent work, thanks

Thanks

This is absolutelly FANTASTIC.Thanks a lot and keep it up.

FARADAY A-tease codes:

01 CPU test failed
02 BIOS ROM checksum test failed
03 CMOS shutdown byte failed
04 Testing DMA page register
05 Testing system timer, programmable interrupt timer
06 Testing system refresh
07 testing system refresh
08 Testing lower 128KB of RAM
09 Testing video controller
0A Testing RAM 128KB to 640KB
0B Testing DMA controller #1
0C Testing DMA controller #2
0D Testing interrupt controller #1
0E Testing interrupt controler #2
0F Testing control port
10 Testing parity
11 Testing CMOS RAM checksum
12 Testing for manufacturing-mode jumper
13 Configure interrupt vectors
14 Testing the keyboard
15 Configuring parallel ports
16 Configuring serial ports
17 Configuring lower 640KB RAM
18 Configuring RAM above 1MB
19 Configuring keyboard
1A Configuring floppy drive
1B Configuring hard-disk drive
1C Configuing game-port adapter
1D Testing and initializing math co-processor
1E Checking CMOS real time clock
1F Calculate and verify CMOS RAM checksum
21 Initialize PROM drivers
22 Test parallel-port loopback
23 Test serial-port loopback
24 Test CMOS real time clock
25 Test the CMOS shutdown
26 Test memory above 1MB
80 Error...divide overflow
81 Error...single step fault
82 Error...NMI stuck on error
83 Error...breakpoint fault
84 Error...Int. 0 detect fault
85 Error...bound error
86 Error...Invalid opcode (BIOS or CPU fault)
87 Error...processor extension not available
88 Error...double-exception error
89 Error...processor extended-segment error
8A Error...invalid task state segment
8B Error...needed segement not present
8C Error...stack segment not present
8D Error...general-protection error
8E Error...general-protection error
8F Error...general-protection error
90 Error...processor-extension error
91-FF Error...spurious interrupts
F3 Error...CPU protected-mode fault
F9 Error...virtual-block move error

TANDON Beep Codes:

Tandon Type A AT 29 Feb 1988 BIOS Post Codes:
01 Test 80286 CPU flags and registers
02 Test BIOS ROM checksum
03 Test MC 146818 CMOS RAM battery - real time clock
04 Test 8254 programmable interrupt controller
05 8254 programmable interrupt controller test failed
06 Initialize RAM refresh
07 Test first 16K RAM
08 Initialize cold boot interrupt vectors
09 Test 8259 programmable interrupt controller and interrupt vectors
0A Fill in temporary interrupt vectors
0B Initialize interrupt vector table 1
0C Initialize interrupt vector table 2
0D Initialize fixed disk vector
0E Interrupt vector test failed
0F Clear keyboard controller input buffer
10 Keyboard controller input buffer clearing failed
11 Run keyboard controller self test
12 Initialize equipment check data area
13 Determine presence of and install 80287 math coprocessor
14 Test MC 146818 CMOS RAM disk value range
15 Test for and install parallel port
16 Test for and install serial port
17 Call interrupt 19 boot loader

Return to Top

Tandon Type B AT 1992 BIOS Post Codes:
01 Cold boot started
06 Initialize chipset if any
07 Warm boot entry; Start of 8042 keyboard controller self test
08 Part of cold boot keyboard initialization passed
09 Keyboard self test passed; Test CMOS checksum
0A Test CMOS RAM battery
0B Save CMOS RAM battery condition in CMOS diagnostic/status register
0C Finished saving CMOS RAM battery condition
0D Test 8254 programmable interrupt timer; Disable RAM parity, I/O parity, DMA controllers and system speaker; Enable timer channel 2
0E 8254 programmable interrupt timer test failed, xx is the failing channel number
0F Initialize 8254 programmable interrupt timer channels; Conduct memory refresh test
10 Refresh test failed
11 Test base 64K RAM and fill with zeros
12 64K RAM test failed - 3 long beeps and system halt
13 64K RAM test passed
14 Set up stack; Disable mappers for systems that support EMS drivers; Initialize battery beep flag parameters for notebook; Perform read/write test of CMOS RAM; Enable error message if failed
15 CMOS RAM read/write test complete
16 Calculating CPU speed; May set to low if CMOS RAM failed
18 Test and initialize both 8259 programmable interrupt controllers
1A 8259 programmable interrupt controllers initialization complete
1B Install interrupt handler and vector for interrupt 0F to check for unexpected interrupts; Halt is unexpected interrupt occurs
1C Unexpected interrupt did not occur; Test 8254 programmable interrupt timer channel 0, IRQ 0 and software interrupt 8 tests
1D Error; Timer 0 interrupt did not occur when expected, system is halted
1E Both 8259 programmable interrupt controllers passed the tests
20 Set up interrupt vectors 02-1F
21 Set up interrupt vectors 70-77
22 Clear interrupt vectors for 41 and 46
23 Read 8042 keyboard controller self test result; DMA page register channel 2
24 Test for proper 8042 keyboard controller self test result
25 Error; Keyboard controller self test failed; System id halted with message displayed
26 Keyboard controller self test passed
27 Confirm DMA working; Prepare DMA channel 2 for floppy data transfer
28 Reinitialize video
29 Reinitialize video with cursor off
2A Video parameters are initialized
2B Enable NMI and I/O channel check; Disable 8254 programmable interrupt timer channel 2 and speaker
2C Run RAM test to determine size of RAM
2D RAM sizing complete
2E Send reset command to keyboard controller to initialize a keyboard scan cycle
2F Keyboard has been initialized; Initialize CMOS real time clock
30 CMOS real time clock has been initialized; Initialize on board floppy if any
31 Install the hard disk controller
32 Disk controller has been initialized; Prepare DMA channel 2 for floppy transfers
33 Perform equipment check and initialize math coprocessor
34 Install the serial and parallel ports
35 Test CMOS RAM battery
36 Check for keystroke
37 Enable 8254 programmable interrupt timer channel 0 for system tick; Enable keyboard and slave interrupt controller 8259 programmable interrupt controller 2
38 Timer tick, keyboard and 8259 programmable interrupt controller 2 have been initialized; Enable/disable cache through CMOS RAM
39 Enable keyboard interface and interrupts; Go to built in setup program as necessary; Shadow ROM's found
3A Set up complete
3B Test the hard disk and floppy disk
3C Scan for and invoke the adapter ROM's in C800-E000
3D Turn of gate A20; Restore vectors 3bh-3fh with temporary interrupt service routines
3E Gate A20 turned on
3F Call interrupt 19 boot loader

Return to Top

Tandon 486 EISA 1989 BIOS Post Codes:
01 Disable cache, enable ROM, high speed on, turn off cache's, disable EISA NMI's, set master/slave IRQ's to edge triggered, disable reset chaining; Disable 82C601 chip
05 Initialize address decoder, 640K RAM; Set BIOS as cacheable, enable extended memory
06 Clear shutdown flag
07 8042 keyboard controller test; Wait till 8042 buffer empty; Disable 8042 command, read 8042 output buffer; Set response ok to DMA page register channel 2
08 Send 8042 keyboard controller NOP command; Get 8042 self test result; Send DMA page register channel 2; If xx=55, then self test ok
09 Test BIOS ROM checksum
0A Read CMOS registers 3 times to clear pending CMOS real time clock interrupts; Disable real time clock interrupts; Check battery
0B Bad CMOS RAM battery
0C Send command to port 61 to disable parity and speaker
0D Test 8254programmable interrupt timer counter
0E One of the counter timers is bad; xx indicates the bad counter
0F Enable and check memory refresh
10 Memory refresh failed
11 Check and clear the first 64K RAM in real mode; Disable NMI; Clear parity latches; Fill 64K with 5555 and check it, then AAA and check it, then 0000
12 First 64K RAM memory test failed
13 First 64K RAM memory test passed
14 Reset the warm boot flag and test CMOS RAM; Turn off caches; Shadow the BIOS; set high speed; Calculate high speed and initialize GP flag; Set low speed and turn off cache if CMOS not good or CMOS speed not high
16 Check shutdown flag 123x
17 Reset was cold boot
18 Prepare 8259 programmable interrupt controllers
19 8259 programmable interrupt controllers initialization failed; Initialize video and display the error message
1A Test 8259 programmable interrupt controller
1B Set interrupt 0F to unexpected interrupt vector; Enable timer and interrupt
1C Set interrupt 08 to timer 0 interrupt vector
1D Timer interrupt did not occur; Initialize video and display error message
1E Initialize interrupt vectors
1F Initialize interrupt vectors 00-6F to temporary interrupt service routines
20 Set vectors for interrupt 02-1F
21 Set interrupt vectors for 70-77, clear vectors 60-67 and 78-FF
22 Clear interrupt vectors for 41 and 46
23 Read 8042 keyboard controller self test results from DMA page register channel 2
24 Test for proper 8042 keyboard controller self test result
25 8042 keyboard controller self test failed
26 Initialize 8042 keyboard controller
27 Check shutdown flag=123x; If no=cold boot
28 If cold boot or CMOS RAM is bad, then install video ROM and initialize video; Initialize equipment flags according to primary video adapter and CMOS RAM content; Initialize POST status
29 If not cold boot and CMOS RAM ok; Install video ROM and initialize video for mono/CGA; Initialize equipment flags according to primary video adapter and CMOS RAM contents
2A Check for bad CMOS RAM
2B Check shutdown flag=123x
2C If cold boot; Turn off caches; Test memory for size and reinitialize cache status
2D Turn off "POST fail" CMOS RAM bit and display and error messages; Initialize keyboard RAM
2E Initialize 8042 keyboard controller and test keyboard
2F Initialize time of day in real time clock
30 Test for and install floppy drive controller
31 Enable 82C601 IDE interface; Test for and install hard disk
32 Test 8259 programmable interrupt controller DMA registers with 55 then AA, then initialize them to 00
33 Test for and initialize math coprocessor
34 Test for and initialize parallel and serial ports
35 Initialize RAM variables for bad CMOS time, date, checksum and battery
36 Wait for user to press Esc or Space; Check for keyboard lock; Clear keyboard lock override; Beep to indicate speed; Display error messages
37 Enable system clock tick (IRQ 0); Enable keyboard (IRQ 1); Enable slave interrupt controller (IRQ 2)
38 Initialize RAM variables for Ctrl-Alt_Esc
39 Enter setup is keystroke pressed
3A Clear screen and update equipment flags according to CMOS RAM contents; Shadow ROM's; Enable/disable cache through CMOS RAM
3B Initialize floppy and hard drives
3C Set POST failed bit in CMOS RAM; Scan for and initialize adapter ROM's
3D Clear the shutdown flag to 0; Disable gate A20 and enable memory wrap in real mode
3E Set vectors for interrupts 3B-3F; Clear post fail bit in CMOS RAM
3F Call interrupt 19 boot loader

SUPERSOFT Beep Codes:



XT BIOS
11 CPU register or logic error
12 ROM POST checksum error
13 8253 programmable interrupt timer channel 0 error
14 8253 programmable interrupt timer channel 1 error
15 8253 programmable interrupt timer channel 2 error
16 8237A DMA controller error
17 8255 parity error detected
18 16K RAM critical region error
19 Memory refresh error
1A -
21 8259 interrupt controller error
22 Unexpected interrupt detected
23 Interrupt 0 (timer) error
24 Nonmaskable interrupt error
25 MDA video memory error
26 CGA video memory error
27 EGA/VGA memory error
28 8087 math coprocessor error
29 Keyboard controller error
2A -
31 Keyboard scan lines/stuck key
32 Floppy controller error
33 Floppy disk read error
34 Memory error at address x
35 Slow refresh, address x
36/37 -
38 -
41 BIOS ROM checksum error
42 BASIC ROM 1 checksum error
43-45 Basic ROM 2,3,4 checksum error




AT BIOS
11 CPU register or logic error
12 ROM POST A checksum error
13 ROM B POST checksum error
14 8254 programmable interrupt timer channel 0 error
15 8254 programmable interrupt timer channel 1 error
16 8254 programmable interrupt timer channel 2 error
17 8237A DMA controller 1 error
18 8237A DMA controller 2 error
19 DMA page registers error
1A 8042 parity error detected
21 16K RAM critical region error
22 Memory refresh error
23 CPU protected mode error
24 8259 programmable interrupt controller 1 error
25 8259 programmable interrupt controller 2 error
26 Unexpected interrupt detected
27 Interrupt 0 (timer) error
28 CMOS real time clock error
29 Nonmaskable interrupt error
2A 8087 math coprocessor error
31 Keyboard controller error
32 Stuck key or CMOS RAM error
33 Floppy controller error
34 Floppy disk read error
35 MDA video memory error
36/37 CGA, EGA/VGA RAM error
38 BIOS ROM checksum error
41 Memory error at address x
42 Slow refresh, address x
43-45 Display pass count
59 No monitor

OLIVETTI Beep Codes:



Olivetti 1076/AT&T BIOS Post Codes:
PASS FAIL DESCRIPTION
41 7F CPU flag and register test
42 7E Check and verify CMOS shutdown code
43 7D BIOS ROM checksum test
44 7C Test the 8253 timer
45 7B Start memory refresh
46 7A Test the 8041 keyboard controller
47 79 Test the first 8KB of RAM
48 78 Test protected mode operation
49 77 Test CMOS RAM shutdown byte
4A 76 Test protected mod operation
4B 75 Test RAM from 8KB to 640KB
4C 74 Test all RAM above 1MB
4D 73 Test NMI
4E 72 Test RAM parity system
50 71 Test 8259 PIC 1
51 6F test 8259 PIC 2
52 6E Test DMA page register
53 6D Test 8237 DMA controller 1
54 6C Test 8237 DMA controller 2
55 6B Test PIO port 61h
56 6A Test the keyboard controller
57 69 Test the CMOS clock/calendar IC
59 68 Test the CPU protected mode
5A 66 Test CMOS RAM battery
5B 65 Test CMOS RAM
5C 64 Verify CMOS RAM checksum
5D 63 Test parallel port configuration
5E 62 Test serial port configuration
5F 61 Test memory configuration below 640KB
60 60 Test memory configuration above 1MB
61 5F Detect and test math coprocessor
62 5E Test configuration of game port adapter
62 5D Test key lock switch
63 5D Test hard drive configuration
64 5C Configure floppy drives
66 5B Test option ROM's
- - Call interrupt 19 boot loader

Return to Top

Olivetti M20 BIOS Post Codes:
Triangle Test CPU registers and instructions
Triangle Test system RAM
4 vertical lines Test CPU call and trap instructions
Diamond Initialize screen and printer drivers
EC0 8255 parallel interface IC test failed
EC1 6845 CRT controller IC test failed
EC2 1797 floppy disk controller chip failed
EC3 8253 timer IC failed
EC4 8251 keyboard interface failed
EC5 8251 keyboard test failed
EC6 8259 PIC IC test failed
EK0 Keyboard did not respond
Ek1 Keyboard responds, but self test failed
ED1 Disk drive 1 test failed
ED0 Disk drive 0 test failed
E10 Non-vectored interrupt error
E11 Vectored interrupt error

Return to Top

Olivetti M24/AT&T BIOS Post Codes:
40 CPU flags and register test failed
41 BIOS ROM checksum test failed
42 Disable 8253 timer channel 1
43 8237 DMA controller test failed
44 8259 PIC test failed
45 Install the real interrupt vectors
48 Send beep and initialize all basic hardware

Return to Top

Olivetti PS/2 BIOS Post Codes:
01 Test CPU
02 Check CMOS shutdown byte
03 Initialize the PIC
04 Test refresh
05 Test CMOS/RTC periodic interrupt
06 Test timer ratio
07 Test first 64KB of RAM
08 Test 8042 keyboard controller
09 Test NMI
0A Test 8254 PIT
0B Test port 94h
0C Test port 103h
0D Test port 102h
0E Test port 96h
0F Test port 107h
10 Blank the display
11 Check the keyboard
12 Test CMOS RAM battery
13 Verify CMOS RAM checksum
14 Verify extended CMOS RAM checksum
15 Initialize system board and adapter
16 Initialize and test RAM
17 Test protected mode registers
18 Test CMOS RAM shutdown byte
19 Test CMOS protected mode
1A Initialize video adapter ROM scan
1B Test BIOS ROM checksum
1C Test PIC #1
1D Test PIC #2
1E Initialize interrupt vectors
1F Test CMOS RAM
20 Test extended CMOS RAM
21 Test CMOS real-time clock
22 Test clock calendar
23 Dummy checkpoint
24 Test watchdog timer
25 Test 64KB to 640KB RAM
26 Configure lower 640KB RAM
27 Test extended memory
28 Initialize extended BIOS data segment and log POST error
29 Configure memory above 1MB
2A Dummy checkpoint
2B Test RAM parity
2C Test DMA page registers
2D Test DMA controller registers
2E Test DMA transfer-count register
2F Initialize DMA controller
30 Test PIO 61
31 Test the keyboard
32 Initialize keyboard typematic rate and delay
33 Test auxiliary device
34 Test advanced protected mode
35 Configure parallel ports
36 Configure 8250 serial ports
37 Test and configure math co-processor
38 Test and configure game-port adapter
39 Configure and initialize hard disk
3A Floppy-disk configuration
3B Initialize ROM drivers
3C Display total memory and hard drives
3D Final initialization
3E Detect and initialize parallel ports
3F Initialize hard drive and controller
40 Initialize math co-processor
42 Initialize adapter ROM scan
CC Unexpected processor excerption occurred
DD Save DDNIL status
EE NMI handler shutdown
FF Call interrupt 19 boot loader

NCR beep codes:

NCR PC6 (XT) BIOS Post Codes:
AA 8088 CPU failure
B1 2764 EPROM checksum failure
B2 8237 DMA controller failure
B3 8253 PIT failure
B4 RAM failure
B5 8259 PIC failure
B6 RAM parity failure
BB All tests passed, ready to boot

Return to Top

NCR AT BIOS Post Codes:
01 Test the CPU registers
02 Test system support I/O
03 Test BIOS ROM checksum
04 Test DMA page registers
05 Test timer channel 1
06 Test timer channel 2
07 Test RAM refresh logic
08 Test base 64KB
09 Test 8/16 bit bus conversion
0A Test interrupt controller 1
0B Test interrupt controller 2
0C Test I/O controller
0D Test CMOS RAM read/write operation
0E Test battery power
0F Test CMOS RAM checksum
10 Test CPU protected mode
11 Test video configuration
12 Test primary video controller
13 Test secondary video controller
20 Display results of tests to this point
21 Test DMA controller 1
22 Test DMA controller 2
23 Test system timer channel 0
24 Initialize interrupt controllers
25 Test interrupts
26 Test interrupts
30 Check base 640KB memory
31 Check extended memory size
32 Test higher 8 address lines
33 Test base memory
34 Test extended memory
40 Test keyboard
41 Test keyboard
42 Test keyboard
43 Test keyboard
44 Test A20 gate
50 Setup hardware interrupt vectors
51 Enable interrupt timer channel 0
52 Check BIOS ROM
60 Test floppy disk controller and drive
61 Test hard disk controller
62 Initialize floppy drives
63 Initialize hard drives
70 Test real time clock
71 Set time of day in RTC
72 Check parallel interface ports
73 Check serial interface ports
74 Check for any option ROM's
75 Check math coprocessor
76 Enable keyboard and RTC interrupts
F0 System not configured properly or hardware defect
F1 Scan and execute any option ROM's
F2 Call interrupt 19 boot loader

Return to Top

NCR PC916 BIOS Post Codes:
01 Test CPU registers
03 Test BIOS ROM checksum
04 Test DMA page registers
05 Test timer channel 1
06 Test timer channel 2
0C Test 8042 keyboard controller
14 Test disabling speed stretch at port 69h
15 Start refresh timer 1
16 Enable speed stretch at port 69h
17 Clear write protect bit
1B Test 64KB shadow RAM
18 Write and test interrupt descriptor table
19 Verify RAM
02 Verify port 61h
07 Test refresh logic
08 Test base 64KB RAM
09 Test 8/16 bit bus conversion logic
0A Test interrupt mask register A
0B Test interrupt mask register B
1A Check 8042 keyboard controller
0D Test CMOS RAM shutdown byte
0E Test CMOS RAM battery power
0F Test CMOS RAM checksum
10 Test CPU protected mode
11 Test video configuration
12 Initialize and test primary video controller
13 Primary video error
20 Display results of tests to this point
21 Test DMA controller 1
22 Test DMA controller 2
23 Test timer 1 counter 0 840nS clock timer
27 Test timer 2 counter 0 for NMI
28 Test timer 2 counter
24 Initialize both interrupt controllers
25 Check for unexpected interrupts
26 Wait for interrupt
30 Check base 640KB memory
31 Check extended memory size
32 Test higher 8 address lines
33 Test base memory
34 Test extended memory up to 256MB
35 Test RAM in segment E000h
40 Test keyboard enable/disable
41 Test keyboard reset command
42 Test keyboard
43 Test keyboard
F4 Display speed setting
45 Initialize the mouse and enable IRQ 1
44 Test address overrun capability
50 Set up hardware interrupt vectors
51 Enable IRQ 0 interval interrupt from timer 0
60 Test for floppy and hard disk controllers and drives
61 Test disk controller
62 Initialize floppy drives
63 Initialize hard drives
74 Check and execute option ROM's from C8000h to DFFFFh
70 Test RTC
71 Set interval timer
72 Configure and test parallel interface
73 Configure and test serial interface
75 Test math coprocessor if installed
76 Enable keyboard and RTC
F0 Display and logged errors
F6 Test base memory
F3 Got to setup if F1 was pressed
F4 Display speed setting
F5 Initialize counter 2 for speed testing
F1 Test system code at E0000h and copy video ROM to shadow memory
F2 Call interrupt 19 boot loader
F6 Test base memory
F7 Test extended memory

HP Vectra Beep 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