Bios (Basic Input Output System)
source : https://www.biosflash.com/e/drivers-bios-updates.htm
Identify hardware errors with unknown beep tones
If you can't find your beep code in our list, you can use the following method to identify the defective hardware:
- Remove RAM memory, Graphics card, other Plug-in cards,
and Drive cables from your mainboard.
Only CPU + Fan + Power cable are installed on the mainboard. - Power on the PC, and listen to the beeps:
- no beeps => Power supply, CPU, mainboard or BIOS is most likely defective.
- some beeps => remember the beeps and next step.
- Power off the PC, and insert the RAM memory.
- Power on the PC, and listen to the beeps:
- no beeps => RAM incorrectly installed.
- same beeps as before => RAM is most likely defective.
- beeps have changed => next step.
- Power off the PC, and insert the Graphics card.
- Power on the PC:
- some beeps => Graphics card is most likely defective.
- blank screen =>Graphics card is most likely defective.
AMI (long+short beeps) |
|
1x short |
DRAM refresh failure |
2x short |
Parity circuit failure |
3x short |
Base 64K RAM failure |
4x short |
System timer failure |
5x short |
Process failure |
6x short |
Keyboard controller Gate A20 error |
7x short |
Virtual mode exception error |
8x short |
Display memory Read/Write test failure |
9x short |
ROM BIOS checksum failure |
10x short |
CMOS shutdown Read/Write error |
11x short |
Cache Memory error |
1x long, 3x short |
Conventional/Extended memory failure |
1x long, 8x short |
Display/Retrace test failed |
AWARD (long+short beeps) |
|
1x long, 2x short |
Indicates a video error has occurred and the BIOS cannot initialize the video screen to display any additional information |
Repeating (Endless loop) |
Memory error. Bad memory or bad connection |
1 Long, 3 Short |
Video adapter failure. Bad video adapter or memory |
High freq. beeps (while running) |
CPU is overheating. CPU fan failure |
Repeating High, Low beeps |
CPU failure. Bad processor |
Any other beep(s) |
RAM problem. |
New BIOS-Chips (incl. programming) --> in my Shop |
|
IBM (long+short beeps) |
|
No Beeps |
No Power, Loose Card, or Short. |
1 Short Beep |
Normal POST, computer is ok. |
2 Short Beep |
POST error, review screen for error code. |
Continuous Beep |
No Power, Loose Card, or Short. |
Repeating Short Beep |
No Power, Loose Card, or Short. |
One Long and one Short Beep |
Motherboard issue. |
One Long and Two short Beeps |
Video (Mono/CGA Display Circuitry) issue. |
One Long and Three Short Beeps. |
Video (EGA) Display Circuitry. |
Three Long Beeps |
Keyboard / Keyboard card error. |
One Beep, Blank or Incorrect Display |
Video Display Circuitry. |
MACINTOSH (different tones) |
|
Error Tone. (two sets of different tones) |
Problem with logic board or SCSI bus. |
Startup tone, drive spins, no video |
Problem with video controller. |
Powers on, no tone. |
Logic board problem. |
High Tone, four higher tones. |
Problem with SIMM. |
New BIOS-Chips (incl. programming) --> in my Shop |
|
PHOENIX (different intervals) |
|
1-1-1-3 |
Verify Real Mode. |
1-1-2-1 |
Get CPU type. |
1-1-2-3 |
Initialize system hardware. |
1-1-3-1 |
Initialize chipset registers with initial POST values. |
1-1-3-2 |
Set in POST flag. |
1-1-3-3 |
Initialize CPU registers. |
1-1-4-1 |
Initialize cache to initial POST values. |
1-1-4-3 |
Initialize I/O. |
1-2-1-1 |
Initialize Power Management. |
1-2-1-2 |
Load alternate registers with initial POST values. |
1-2-1-3 |
Jump to UserPatch0. |
1-2-2-1 |
Initialize keyboard controller. |
1-2-2-3 |
BIOS ROM checksum. |
1-2-3-1 |
8254 timer initialization. |
1-2-3-3 |
8237 DMA controller initialization. |
1-2-4-1 |
Reset Programmable Interrupt Controller. |
1-3-1-1 |
Test DRAM refresh. |
1-3-1-3 |
Test 8742 Keyboard Controller. |
1-3-2-1 |
Set ES segment to register to 4 GB. |
1-3-3-1 |
28 Autosize DRAM. |
1-3-3-3 |
Clear 512K base RAM. |
1-3-4-1 |
Test 512 base address lines. |
1-3-4-3 |
Test 512K base memory. |
1-4-1-3 |
Test CPU bus-clock frequency. |
1-4-2-4 |
Reinitialize the chipset. |
1-4-3-1 |
Shadow system BIOS ROM. |
1-4-3-2 |
Reinitialize the cache. |
1-4-3-3 |
Autosize cache. |
1-4-4-1 |
Configure advanced chipset registers. |
1-4-4-2 |
Load alternate registers with CMOS values. |
2-1-1-1 |
Set Initial CPU speed. |
2-1-1-3 |
Initialize interrupt vectors. |
2-1-2-1 |
Initialize BIOS interrupts. |
2-1-2-3 |
Check ROM copyright notice. |
2-1-2-4 |
Initialize manager for PCI Options ROMs. |
2-1-3-1 |
Check video configuration against CMOS. |
2-1-3-2 |
Initialize PCI bus and devices. |
2-1-3-3 |
Initialize all video adapters in system. |
2-1-4-1 |
Shadow video BIOS ROM. |
2-1-4-3 |
Display copyright notice. |
2-2-1-1 |
Display CPU type and speed. |
2-2-1-3 |
Test keyboard. |
2-2-2-1 |
Set key click if enabled. |
2-2-2-3 |
56 Enable keyboard. |
2-2-3-1 |
Test for unexpected interrupts. |
2-2-3-3 |
Display prompt "Press F2 to enter SETUP". |
2-2-4-1 |
Test RAM between 512 and 640k. |
2-3-1-1 |
Test expanded memory. |
2-3-1-3 |
Test extended memory address lines. |
2-3-2-1 |
Jump to UserPatch1. |
2-3-2-3 |
Configure advanced cache registers. |
2-3-3-1 |
Enable external and CPU caches. |
2-3-3-3 |
Display external cache size. |
2-3-4-1 |
Display shadow message. |
2-3-4-3 |
Display non-disposable segments. |
2-4-1-1 |
Display error messages. |
2-4-1-3 |
Check for configuration errors. |
2-4-2-1 |
Test real-time clock. |
2-4-2-3 |
Check for keyboard errors |
2-4-4-1 |
Set up hardware interrupts vectors. |
2-4-4-3 |
Test coprocessor if present. |
3-1-1-1 |
Disable onboard I/O ports. |
3-1-1-3 |
Detect and install external RS232 ports. |
3-1-2-1 |
Detect and install external parallel ports. |
3-1-2-3 |
Re-initialize onboard I/O ports. |
3-1-3-1 |
Initialize BIOS Data Area. |
3-1-3-3 |
Initialize Extended BIOS Data Area. |
3-1-4-1 |
Initialize floppy controller. |
3-2-1-1 |
Initialize hard-disk controller. |
3-2-1-2 |
Initialize local-bus hard-disk controller. |
3-2-1-3 |
Jump to UserPatch2. |
3-2-2-1 |
Disable A20 address line. |
3-2-2-3 |
Clear huge ES segment register. |
3-2-3-1 |
Search for option ROMs. |
3-2-3-3 |
Shadow option ROMs. |
3-2-4-1 |
Set up 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 key stroke. |
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 |
Clear screen (optional). |
3-4-4-4 |
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. |
4-3-1-3 |
Initialize the chipset. |
4-3-1-4 |
Initialize refresh counter. |
4-3-2-1 |
Check for Forced Flash. |
4-3-2-2 |
Check HW status of ROM. |
4-3-2-3 |
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. |
4-3-4-1 |
Boot the Flash program. |
4-3-4-2 |
Initialize the boot device. |
4-3-4-3 |
Boot code was read OK. |
Bios Software Links
BIOS-Boot-USB-Stick
- Instruction to create a bootable USB-Stick to make a BIOS Update.
BIOS-Boot-CD -
Instruction to create a bootable CD to make a BIOS Update.
BIOS-Boot-Diskette
- Instruction to create a bootable DOS-Diskette to make a BIOS Update.
ctbios v1.5 - shows
Passwords, BIOS-ID, Mainboard type and -manufacturer, DMI, ESCD, etc. (contains
ctdmi.exe v1.50).
Cmospwd v4.3 -
CMOS-Password encoding for different BIOS manufacturers.
pwdigit - Password-Cracker
for AWARD-BIOS. Version 4.3 up to 4.51 (incl. Sourcecode).
ctdmiw v1.3 - shows
Desktop Management Interface (DMI) informations.
Bootdisk - creates a
FreeDOS Bootdiskette (for BIOS flashing).
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