http://blog.sina.com.cn/s/blog_55c555f10102vtz1.html
https://blog.csdn.net/ruyanhai/article/details/7181842
博客本身有错误需要参考评论
汇编语言王爽p175
https://blog.csdn.net/jiangwei0512/article/details/50611778
可以通过操作92h端口来打开A20
https://blog.csdn.net/JessenChen/article/details/5680486?utm_source=jiancool
92h端口
https://bbs.csdn.net/topics/370099882
https://www.cnblogs.com/zhengwenyi/articles/3590353.html
https://blog.csdn.net/husion01/article/details/6453538
需要看评论
https://www.cnblogs.com/DeeLMind/p/6882949.html