https://blog.wongcw.com/2020/06/22/42%e5%b9%b4%e5%89%8d%e7%9a%84intel-d8088-2%e8%99%95%e7%90%86%e5%99%a8%e9%87%8d%e6%96%b0%e9%96%8b%e8%b3%a3%ef%bc%9a3%e5%be%ae%e7%b1%b3%e5%b7%a5%e8%97%9d%e3%80%818mhz%e9%a0%bb%e7%8e%87/