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6.15.20 BP compatibility: Turbo3

The following listing contains the interface of the Turbo3 unit.

This is a compatibility unit to BP's Turbo3 compatibility unit to TP3. ;−) It is not meant to be used in any newly written code.

     { Turbo Pascal 3.0 compatibility unit
       Copyright (C) 1998-2005 Free Software Foundation, Inc.
       Author: Frank Heckenbach <>
       This file is part of GNU Pascal.
       GNU Pascal is free software; you can redistribute it and/or modify
       it under the terms of the GNU General Public License as published
       by the Free Software Foundation; either version 2, or (at your
       option) any later version.
       GNU Pascal is distributed in the hope that it will be useful, but
       WITHOUT ANY WARRANTY; without even the implied warranty of
       General Public License for more details.
       You should have received a copy of the GNU General Public License
       along with GNU Pascal; see the file COPYING. If not, write to the
       Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
       02111-1307, USA.
       As a special exception, if you link this file with files compiled
       with a GNU compiler to produce an executable, this does not cause
       the resulting executable to be covered by the GNU General Public
       License. This exception does not however invalidate any other
       reasons why the executable file might be covered by the GNU
       General Public License. }
     {$if __GPC_RELEASE__ < 20030412}
     {$error This unit requires GPC release 20030412 or newer.}
     unit Turbo3;
     import GPC only (AssignTFDD);
            System (MemAvail => System_MemAvail,
                    MaxAvail => System_MaxAvail);
            CRT (LowVideo  => CRT_LowVideo,
                 HighVideo => CRT_HighVideo);
       Kbd: Text;
       CBreak: Boolean absolute CheckBreak;
     procedure AssignKbd (var f: AnyFile);
     function  MemAvail: Integer;
     function  MaxAvail: Integer;
     function  LongFileSize (var f: AnyFile): Real;
     function  LongFilePos  (var f: AnyFile): Real;
     procedure LongSeek     (var f: AnyFile; aPosition: Real);
     procedure LowVideo;
     procedure HighVideo;