Error with: for EntryName use at 16#address#;

["Jean-David Tr�panier" <JDT@hy.cgocable.ca>]

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Hi! I have a little problem for handling an interrupt. I receive this error
at the compilation of the code below:  Expression has no possible
interpretation as an expression of the expected type Address, Continuing



   with Text_IO; with System;
   procedure main is
--------TASK-----------
     task TKeyboard is
         entry keyp;
         for Keyp use at 16#20#;       -- Error at this line
     end TKeyboard;

     task body TKeyboard is
     begin
         loop
         accept keyp do
               text_io.put_line("Keypressed (numlock)");
         end keyp;
         end loop;
    end TKeyboard;
------END TASK---------

 begin
      ...
 end main;

Is it a good way to handle interrupt or it's preferable to use
Attach_Handler(Handler, Int_ID) in the interrupt package.

Thanks,

Jean-David Tr�panier
(JDT@hy.cgocable.ca)