Звук через PC Speaker

procedure TForm1.mybeep(Tone: Word; Delay: Integer);
begin
  asm
    mov   al,  0b6H
    out   43H, al
    mov ax,Tone
    out 42h,al
    ror ax,8
    out 42h,al
    in    al,  61H
    or    al,  03H
    out   61H, al
  end;
  sleep(Delay);
  asm
    in    al,  61H
    and   al,  0fcH
    out   61H, al
  end;
end;