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From: Samuel Tardieu <sam@ada.eu.org>
Subject: Re: Low Level IO
Date: 1998/08/06
Message-ID: <m390l2ujqi.fsf@zaphod.enst.fr>#1/1
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Date: 1998-08-06T00:00:00+00:00
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>>>>> "Jose" == JOSE VICENTE <319089@cepsz.unizar.es> writes:

Jose> Does anyone know how can I read/write the parallel port using
Jose> Linux and Gnat 3.10 ?

It has nothing to do with GNAT. If you try the same thing in C with

   main() { *(char *)0x3bc = 0; }

you will get a segmentation fault.

When you are using a real OS (such as Linux), you have to ask the OS
to give you certain permissions (on Linux, look at ioperm() and iopl()).

Moreover, the memory space you see has nothing to do with the physical 
memory, that means that 16#3bc# doesn't point onto the parallel port.

  Sam
-- 
Samuel Tardieu -- sam@ada.eu.org