Nachos是一种供教学用的操作系统，三本书详细介绍了Nachos操作系统，并介绍了功能函数．可作为对操作系统学习的一个好的对象．-Nachos is an operating system for teaching purposes, three books detailed the Nachos operating system, and introduced the function. Learning of the operating system can be used as a go