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From: Markus Kuhn <Markus.Kuhn@cl.cam.ac.uk>
Subject: Re: Clear screen command?
Date: 1998/03/05
Message-ID: <34FE8F35.1DD7ECFD@cl.cam.ac.uk>#1/1
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Organization: Cambridge University, Computer Laboratory
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Date: 1998-03-05T00:00:00+00:00
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To clear a screen on any ISO 6429 compatible terminal (that's
everything claiming to be VT100 or ANSI or xterm compatible),
just use procedures such as

-- warning: the following code is untested

with Ada.Characters.Latin_1; use Ada.Characters.Latin_1;

procedure Clear_Screen is
begin
  put(ESC & "[2J");
end;

procedure Goto_XY(Row, Column: Natural) is
begin
  put(ESC & "[");
  put(Row);
  put(';');
  put(Column);
  put('H');
end;

For all the VT100/ISO 6429 commands, see for instance 

  http://www.fh-jena.de/~gmueller/Kurs_halle/esc_vt100.html

Completing the above into a nice ISO6429 package for controlling
text terminals is left as a small exercise to the reader.

Hope this helped ...

Markus

-- 
Markus G. Kuhn, Security Group, Computer Lab, Cambridge University, UK
email: mkuhn at acm.org,  home page: <http://www.cl.cam.ac.uk/~mgk25/>