| 1. | Once these changes ( dual mode , privileged instructions , memory protection , timer interrupt ) have been made to the basic computer architecture , it is possible to write a correct operating system
一旦对一个基本的计算机体系结构完成了以上修改（双模式、特许指令、内存保护、定时器中断） ，就有可能写出正确的操作系统。 |
