System beep codes

After repeated requests for beep codes i’ve determined to submit them right here perhaps they might be pinned
Standard Original IBM POST Error Codes
Code Description
B brief beep System is OK
P brief beeps POST Error – error code proven on display No beep Power provide or system board drawback Continuous beep Power provide, system board, or keyboard drawback Repeating brief beeps Power provide or system board drawback
B lengthy, M brief beep System board drawback
B lengthy, P brief beeps Display adapter drawback (MDA, CGA)
B lengthy, A brief beeps Display adapter drawback (EGA)
O lengthy beeps 3270 keyboard card
IBM POST Diagnostic Code Descriptions
Code Description

one hundred – 199 System Board
200 – 299 Memory
300 – 399 Keyboard
four hundred – 499 Monochrome Display
500 – 599 Colour/Graphics Display
600 – 699 Floppy-disk drive and/or Adapter
seven hundred – 799 Math Coprocessor
900 – 999 Parallel Printer Port
one thousand – 1099 Alternate Printer Adapter
1100 – 1299 Asynchronous Communication Device, Adapter, or Port
1300 – 1399 Game Port
1400 – 1499 Colour/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 O.H” Disk Drive
8900 – 8999 MIDI Adapter
11200 – 11299 SCSI Adapter
21000 – 21099 SCSI Fixed Disk and Controller
21500 – 21599 SCSI CD-ROM System
AMI BIOS Beep Codes
Code Description
M Short Beep System OK
P Short Beeps Parity error within the first sixty four KB of reminiscence
A Short Beeps Memory failure within the first sixty four KB
A Short Beeps Memory failure within the first sixty four KB Operational of reminiscence
or Timer B on the motherboard is just not functioning
H Short Beeps The CPU on the motherboard generated an error
S Short Beeps The keyboard controller could also be dangerous. The BIOS can’t change to protected mode
S Short Beeps The CPU generated an exception interrupt
H Short Beeps The system video adapter is both lacking, or its reminiscence is defective
N Short Beeps The ROM checksum worth doesn’t match the worth encoded within the BIOS
10 Short Beeps The shutdown register for CMOS RAM failed
eleven Short Beeps The exterior cache is defective
M Long, A Short Beeps Memory Problems
B Long, H Short Beeps Video Card Problems
Phoenix BIOS Beep Codes
Note – Phoenix BIOS emits three units of beeps, separated by a quick pause.
Code Description

B-B-O CMOS learn/write failure
M-M-A ROM BIOS checksum error
M-P-B Programmable interval timer failure
M-P-P DMA initialisation failure
B-P-O DMA web page register learn/write failure
B-O-M RAM refresh verification failure
M-A-A First 64k RAM chip or knowledge line failure
B-A-A First 64k RAM odd/even logic failure
B-A-B Address line failure first 64k RAM
M-A-P Parity failure first 64k RAM
P-_-_ Faulty Memory
O-B-_ Faulty Motherboard
A-P-A Keyboard controller Test failure
A-A-A Screen initialisation failure
A-A-B Screen retrace check failure
A-A-P Search for video ROM in progress
A-P-B Timer tick interrupt in progress or failure
A-P-P Shutdown check in progress or failure
A-P-A Gate A20 failure
A-P-A Unexpected interrupt in protected mode
A-A-B RAM check in progress or failure>ffffh
A-O-P Faulty Motherboard
A-A-A Interval timer channel P check or failure
A-A-A Time of Day clock check failure
A-A-B Serial port check or failure
A-A-P Parallel port check or failure
A-A-O Math coprocessor check or failure
Low B-M-P System Board choose failure
Low M-B-O Extended CMOS RAM failure