Thanks Michael, 
I also tried with a 20 ms delay. No success. Still investigating.
----- Mail Original -----
De: "Michael Van Canneyt" <mich...@freepascal.org>
À: "FPC-Pascal users discussions" <fpc-pascal@lists.freepascal.org>
Envoyé: Vendredi 9 Décembre 2011 22h51:01 GMT +01:00 Amsterdam / Berlin / Berne 
/ Rome / Stockholm / Vienne
Objet: Re: [fpc-pascal] How to poll for a byte in Input?
>...
I do not think this is correct if the timeout is zero. 
You should specify a timeout.

Michael.
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