Appendix B: Beep and POST Codes

Code

Beeps

POST Routine Description

 

 

 

9C

 

Set up Power Management.

9E

 

Enable hardware interrupts.

A0

 

Set time of day.

A2

 

Check key lock.

A4

 

Initialize typematic rate.

A8

 

Erase F2 prompt.

AA

 

Scan for F2 keystroke.

AC

 

Enter SETUP.

AE

 

Clear in-POST flag.

B0

 

Check for errors.

B2

 

POST done - prepare to boot operating system.

B4

 

One beep.

B6

 

Check password (optional).

B8

 

Clear global descriptor table.

BC

 

Clear parity checkers.

BE

 

Clear screen (optional).

BF

 

Check virus and backup reminders.

C0

 

Try to boot with INT 19.

D0

 

Interrupt handler error.

D2

 

Unknown interrupt error.

D4

 

Pending Interrupt.

D6

 

Initialize option ROM error.

D8

 

Shutdown error.

DA

 

Extended Block Move.

DC

 

Shutdown 10 error.

 

 

The following are for boot block in Flash ROM:

E2

 

Initialize the chipset.

E3

 

Initialize refresh counter.

E4

 

Check for Forced Flash.

E5

 

Check HW status of ROM.

E6

 

BIOS ROM is OK.

E7

 

Do a complete RAM test.

E8

 

Do OEM initialization.

E9

 

Initialize interrupt controller.

EA

 

Read in the bootstrap code.

EB

 

Initialize all vectors.

EC

 

Boot the Flash program.

ED

 

Initialize the boot device.

EE

 

Boot code was read OK.

 

 

 

B-4

M54E2 System Board Manual