说明：  采用intel芯片组的四层主板印刷电路板图，曾经大量量产，虽然现在已经过时了，但对初学者而言，仍具有一定参考意义，可看到主板的布线，布局非常细致。
(use intel chip set four main board printed circuit board map, have large volume production, Although it is already obsolete, but for beginners, still has some reference value, we can see the Main Board of wiring, Layout is very meticulous.)