Nachos教学用操作系统
作为教学用操作系统，需要实现简单并且尽量缩小与实际操作系统之间的差距，所以我们采
用Nachos作为操作系统课程的教学实践平台。Nachos是美国加州大学伯克莱分校在操作系
统课程中已多次使用的操作系统课程设计平台，在美国很多大学中得到了应用(Nachos is an instructional operating system for undergraduate OS classes. It is a challenging system to learn, but is also as rewarding as it is challenging.

Nachos may seem complex (it is) and confusing at first, but after using the system for a while you will become familiar and comfortable with it. There are also some advantages with using such a well-established project. First, it has been thoroughly debugged and is therefore relatively stable. Second, there is extensive documentation describing the Nachos system. Both of these aspects should make it easier for you to learn and use Nachos.

During the quarter we will be starting with a pre-project and then doing three substantial projects:

Introduction
Threads
Processes and Multiprogramming
Virtual Memory)