What is an operating system? What are the two major functions of an Operating system? What is needed for a computer to start and load Operating system? Why do operating systems use interrupts?  Differentiate between software and hardware interrupt.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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  1. What is an operating system? What are the two major functions of an Operating system? What is needed for a computer to start and load Operating system? Why do operating systems use interrupts?  Differentiate between software and hardware interrupt.
  2. Why is a device driver needed for each of the IO device? What is DMA?  What is the purpose of cache memory?

We discussed to types of user interface (shell), what are they? The part of the operating system users access through system calls is called?

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