From mboxrd@z Thu Jan  1 00:00:00 1970
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From: Hung Huynh <d95hung@dtek.chalmers.se>
Subject: Re: How can I clear the screen?
Date: 1996/03/29
Message-ID: 
 <Pine.SOL.3.92.960329152609.24383A-100000@hanto.dtek.chalmers.se>#1/1
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references: <4jbr2n$djp@daily-planet.nodak.edu> <4jfqqv$ekh@news.pacifier.com>
to: Steve Doiel <steved@pacifier.com>
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organization: Chalmers University of Technology
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newsgroups: comp.lang.ada
Date: 1996-03-29T00:00:00+00:00
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> Well, you don't describe your platform or environment, but the following
> works in a text mode window using GNAT on OS/2.  It isn't the most
> elegant set of routines or methods, but they work for me.  I believe they
> rely on the ole ANSI.SYS (or equivalent for OS/2) driver.

Hi! I tried your package in a unix xterm window and it worked fine.
But could you explain how this procedure work? I'm a novice.

------------------------------------------
 PROCEDURE ClearScreen IS

 BEGIN
   Put( CSI & "2J" );
 END ClearScreen;
------------------------------------------

I understand that your CSI is equal to  ESC & "[" , but why does the
output of the string "ESC[2J" cause a screen clear? Does it have something
to do with ANSI?