{Detctgrf.PAS}
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  {Sample code for the Detectgraph function.}

  uses Graph;

  var GraphDriver, GraphMode: Integer;
  begin
    DetectGraph(GraphDriver, GraphMode);
    if (GraphDriver = EGA) or
       (GraphDriver = EGA64) then
    begin
      GraphDriver := CGA;
      GraphMode := CGAHi;
    end;
    InitGraph(GraphDriver, GraphMode,'');
    if GraphResult <> grOk then
      Halt(1);
    Line(0, 0, GetMaxX, GetMaxY);
    Readln;
    CloseGraph;
  end.