Specifications

B-1

Beep and POST Codes

Beep codes are a series of beeps sent through the speaker which

indicate a problem during the Power On Self Test (POST). If text

appears on the video screen, the M54Hi-Plus has completed POST; any

other tone from the speaker indicates something other than a POST

error. These tones are not described in Table B-1.

The beep error codes are a series of beeps. The duration of the beep

tones are constant, but the length of the pauses between the beeps

varies. For example: a 1-3-3 beep code will sound like one beep, a

pause; three beeps consecutively, another pause; and then three more

beeps.

One beep code is often misunderstood. If a video card is not installed

or is failing, the system board will generate a long-short-long-short

beep code. This is often interpreted as a 1-2-1 beep code. But POST

errors always vary in the length of the pause and not the duration of the

beep tone.

Another way of identifying a POST error is to use a device called a

POST card. This peripheral card is inserted into one of the ISA slots

and has an LED (or LCD) read out showing the contents of port 80h.

The following table provides a list of all beep codes and POST rou-

tines..