Laboratory work is an essential part of the learning experience in many areas of Computer Science, and this is particularly true in the area of operating systems. To support laboratory work in operating systems, we have created SunOS Minix, a version of the Minix operating system that runs as a process under Sun Unix (SunOS). To date, projects for two advanced classes on operating systems have involved extensive work with the SunOS Minix source code. Also, we are in the process of developing a novel graphical monitoring and control interface that will make SunOS Minix a powerful tool for use in introductory operating system laboratories.