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7.01 What do the POST beeps mean?




Description

This item is from the PC Hardware FAQ, by Willie Lim and Ralph Valentino with numerous contributions by others. (v1.25).

7.01 What do the POST beeps mean?

This section contains information on the following:

	IBM
	AMI 
	Phoenix
	DTK/ERSO XT BIOS
	MR BIOS
	Mylex 386 System BIOS
	Quadtel AT Compatible BIOS

[From: Shaun Burnett (burnesa@cat.com)] POST (Power-On Self Test) beeps signal something is wrong with your system. The meaning of these beeps is BIOS dependent. Below are the audio codes for IBM, AMI, and Phoenix BIOS's.

IBM

Beep(s)                 Errant device
No beep                 Power supply, system board
1 short beep            System OK
2 short beeps           POST Error displayed on monitor
Repeating short beeps   Power supply, system board
3 long beeps            3270 keyboard card
1 long, 1 short beeps   System board
1 long, 2 short beeps   Display adapter (MDA, CGA)
1 long, 3 short beeps   EGA
Continuous beep         Power supply, system board

AMI

Beep(s)                 Failure
1 short                 DRAM refresh
2 short                 Parity circuit
3 short                 Base 64K RAM
4 short                 System timer
5 short                 Processor
6 short                 Keyboard controller Gate A20 error
7 short                 Virtual mode exception error
8 short                 Display memory R/W test
9 short                 ROM BIOS checksum
1 long, 3 short         Non-fatal--Conventional/extended memory
1 long, 8 short         Non-fatal--Display/retrace test

PHOENIX

Beep    Fatal Failures* Beep code      Non-Fatal Failures* code
1-1-3   CMOS write/read  (or real-     4-2-1   Timer tick interrupt test
         time clock read/write)                 (or in progress)
1-1-4   ROM BIOS checksum              4-2-2   Shutdown test (or in progress)
1-2-1   Programmable interval timer    4-2-3   Gate A20 failure
1-2-2   DMA initialization             4-2-4   Unexpected interrupt in
                                                protected mode
1-2-3   DMA page register write/read   4-3-1   RAM test in progress or
                                                address failure > FFFFh
1-2-4   SRAM test and configuration    4-3-3   Interval timer Channel 2
                                                (or test)
1-3-1   RAM refresh verification       4-3-4   Time-of-day clock (or test)
1-3-3   1st 64kb RAM chip or data      4-4-1   Serial port (or test)
         line failure, multibit
1-3-4   First 64K RAM odd/even logic   4-4-2   Parallel port (or test)
1-4-1   Address line failure first     4-4-3   Math coprocessor (or test)
         64K RAM
1-4-2   Parity failure first       low 1-1-2   System-board select
         64K RAM
2-1-1   Bit 0 first 64K RAM        low 1-1-3   Extended CMOS RAM
2-1-2   Bit 1 first 64K RAM
2-1-3   Bit 2 first 64K RAM
2-1-4   Bit 3 first 64K RAM
2-2-1   Bit 4 first 64K RAM
2-2-2   Bit 5 first 64K RAM
2-2-3   Bit 6 first 64K RAM
2-2-4   Bit 7 first 64K RAM
2-3-1   Bit 8 first 64K RAM
2-3-2   Bit 9 first 64K RAM
2-3-3   Bit 10 first 64K RAM
2-3-4   Bit 11 first 64K RAM
2-4-1   Bit 12 first 64K RAM
2-4-2   Bit 13 first 64K RAM
2-4-3   Bit 14 first 64K RAM
2-4-4   Bit 15 first 64K RAM
3-1-1   Slave DMA register
3-1-2   Master DMA register
3-1-3   Master interrupt mask
         register failure
3-1-4   Slave interrupt mask
         register failure
3-2-4   Keyboard controller test
         failure
3-3-4   Screen initialization
3-4-1   Screen retrace
3-4-2   Search for video ROM in
         progress (not failure)
* Unless otherwise noted.

[From: Will Spencer (will@gnu.ai.mit.edu)]

DTK/ERSO XT BIOS

1 short					- Begin POST and End POST
1 long, 1 short				- Floppy Disk Drive or Controller 
					  Failure
Continuous short			- Parity Error in First 64K RAM
Continuous tone				- First 64K RAM failure
1 long					- Keyboard Failed or Locked, Interrupt
					  or other system board error
long short, long short, long short	- Video Initialization Failure, or
				  	  Invalid Video Switch Setting

MR BIOS

:POST Code 1A Beep Codes
low high, low high low high high	- Real Time Clock is Not Updating
 
:POST Code 03 Beep Codes
low high, low low low			- ROM BIOS Checksum Test
 
:POST Code 04 Beep Codes
low high, high low low			- Page Register Test (Ports 81-8F)
 
:POST Code 05 Beep Codes
low high, low high low			- 8042 Keyboard Controller Selftest
 
:POST Code 07 Beep Codes
low high, high high low			- Memory Refresh Circuit Test
 
:POST Code 08 Beep Codes
low high, low low high			- Master (16bit) DMA Controller
					  Failure
low high, high low high			- Slave (8 bit) DMA Controller
					  Failure
 
:Post Code 0A Beep Codes
low high, low low low low		- Memory Bank 0 Pattern Test Failure
low high, high low low low		- Memory Bank 0 Parity Circuitry
					  Failure
low high, low high low low		- Memory Bank 0 Parity Error
low high, high high low low		- Memory Bank 0 Data Bus Failure
low high, low low high low		- Memory Bank 0 Address Bus Failure
low high, high low high low		- Memory Bank 0 Block Access Read
					  Failure
low high, low high high low		- Memory Bank 0 Block Access
					  Read/Write Failure
 
:POST Code 0B Beep Codes
low high, high high high low		- Master 8259 (Port 21 ) Failure
low high, low low low high		- Slave 8259 (Port A1) Failure
 
:POST Code 0C Beep Codes
low high, high low low high		- Master 8259 (Port 20) Interrupt
					  Address Error
low high, low high low high		- Slave 8259 (Port A0) Interrupt
					  Address Error
low high, high high low low		- 8259 (Port 20/A0) Interrupt
					  Address Error
low high, low low high high		- Master 8259 (Port 20) Stuck
					  Intercept Error
low high, high low high high		- Slave 8259 (Port A0) Stuck
					  Intercept Error
low high, low high high high		- System Timer 8254 CH0/IRQ0
					  Interrupt Failure
 
:POST Code 0D Beep Codes
low high, high high high high		- 8254 Channel 0 Test and
					  Initialization
 
:POST Code 0E Beep Codes
low high, low low low low high		- 8254 Channel-2 (Speaker) Failure
low high, high low low low high		- 8254 OUT2 (Speaker Detect) Failure
 
:POST Code 0F Beep Codes
low high, low high low low high		- CMOS RAM Read/Write Test Failure
low high, high high low low high	- RTC Periodic Interrupt / IRQ8
					  Failure
 
:POST Code 10 Beep Codes
low high, low low high low high		- Video Initialization and
					  (Cold-Boot) Signon Message
 
:POST Code 12 Beep Codes
low high, high low high low high	- Keyboard Controller Failure
 
:POST Code 17 Beep Codes
low high, low low low high high		- A20 Test Failure Due to 8042
					  Timeout
low high, high low low high high	- A20 Gate Stuck in Disabled State
 
:POST Code 19 Beep Codes
low high, low high high low high	- Memory Parity Error
low high, high high high low high	- IO Channel Error

Mylex 386 System BIOS

long					- Begin POST Beep Code
2 long					- Video Card Bad or No Video Card
long, short, long			- Keyboard Controller Error
long, 2 short, long			- Keyboard Error
long, 3 short, long			- Programmable Interrupt Controller
					  (8259-1) Error
long, 4 short, long			- Programmable Interrupt Controller
					  (8259-1) Error
long, 5 short, long			- DMA Page Register Error
long, 6 short, long			- RAM Refresh Error
long, 7 short, long			- RAM Data Test Error
long, 8 short, long			- RAM Parity Error
long, 9 short, long			- DMA Controller 1 Error
long, 10 short, long			- CMOS RAM Failure
long, 11 short, long			- DMA Controller 2 Error
long, 12 short, long			- CMOS RAM Battery Failure
long, 13 short, long			- CMOS Checksum Failed
long, 14 short, long			- BIOS ROM Checksum Failed
several long beeps			- Multiple failures

Quadtel AT Compatible BIOS

3 short					- Any Failure

 

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