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From: Robert Dewar <robert_dewar@my-deja.com>
Subject: Re: GNAT-DOS delay bug
Date: 1999/08/11
Message-ID: <7osb10$gvv$1@nnrp1.deja.com>#1/1
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References: <37B1346B.4084A7D3@it.swin.edu.au>
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Date: 1999-08-11T00:00:00+00:00
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In article <37B1346B.4084A7D3@it.swin.edu.au>,
  RAllen@swin.edu.au wrote:
> Specifically I am using EZ2LOAD, that is, GNAT3.10 DOS with
DJGPP 2.01
> (Why not the 3.11 Win32 GNAT?  Because I also want to run the
code on a
> 486 to control a model railroad -- to teach real-time
programming
> including interrupt handling.  Am I wrong in this approach?)
The bug
> shows up on Pentium Pros and IIs all running NT4.0sp3.
>
> The problem is that delay statements (except delay 0.0)
produce illegal
> memory refs to 0xFFFFFFFF immediately crashing the run whether
running
> the EXE directly or via the adacaps Run.

Yes, this is most certainly a bug. It is unlikely that it can
be fixed in the ancient version of the compiler you are using.
I don't know if the DOS version ever got upgraded to 3.11, you
could contact Mike Feldman for details -- or perhaps he will
see this and answer.

I would definitely switch to the NT/Win95 version, and then
figure out how to send the necessary control signals to your
model railroad stuff using the Win32 API. Of course if you
have specialized boards and so on that you are plugging in,
then you would have to write drivers for them, which is not
trivial (though certainly possible).


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