1. What are the three main purposes of an operating system?
2. What are the main differences between operating systems for mainframe computers and personal computers?
3. Some CPUs provide for more than two modes of operation. What are two possible uses of these multiple modes?
4. What is the main difficulty that a programmer must overcome in writing an operating system for a real-time environment?
5. What is the purpose of system calls?
6. What are the five major activities of an operating system in regard to process management?
7. What are the three major activities of an operating system in regard to memory management?
8. What are the three major activities of an operating system in regard to secondary-storage management?
9. List five services provided by an operating system. Explain how each provides convenience to the users. Explain also in which cases it would be impossible for user-level programs to provide these services.
10. What is the purpose of system programs?
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