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From: cjl@iucs.cs.indiana.edu
Newsgroups: comp.lang.pascal
Subject: Re: Reading Function Keys - Turbo Pasca
Message-ID: <126200001@iucs>
Date: Sun, 8-Nov-87 17:02:00 EST
Article-I.D.: iucs.126200001
Posted: Sun Nov  8 17:02:00 1987
Date-Received: Wed, 11-Nov-87 05:02:48 EST
References: <1329@cup.portal.com>
Organization: Indiana University CSCI, Bloomington
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Nf-ID: #R:cup.portal.com:-132900:iucs:126200001:000:789
Nf-From: iucs.cs.indiana.edu!cjl    Nov  8 17:02:00 1987



> The function keys actually return two codes when pressed.  The first of
> these is an escape (ascii 27).  (NOTE:  This is in TP ONLY.  In reality the
> first scan code is 0, and most languages use that.  I don't know why Borland
> coverted it).  The second is ...

  According to ASCII, ESC (27) is used for designating escape sequence
  not the NUL (0) character. For example Microsoft's driver ANSI.SYS 
  is consistently using ESC as the output escape character not 
  NUL character.

  Unfortunately many application programs use ESC as an input command
  e.g. aborting the execution. I guess it is for this reason IBM uses
  NUL as the input escape character not ESC.

C.J.Lo
Dept. of CIS, IUPUI
cjl@iucs.cs.indiana.edu
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