unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs;

type
  TForm1 = class(TForm)
    procedure FormClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

uses DriverIOCtl;

{$R *.DFM}

procedure TForm1.FormClick(Sender: TObject);
begin
WritePortB($EDC8, 0);
Caption := IntToStr(ReadPortB($EDCF));
end;

end.