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Helios System Board Manual
Appendix C: Beep and POST Codes
73
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 Helios has
completed POST; any other tone from the speaker indi-
cates something other than a POST error. These tones
are
not described in the tables on the following pages.
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 consecu-
tively, 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 inter-
preted 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 tables list all beep codes and POST rou-
tines.
Appendix
C