Week 5 - Operating System Fundamental

Question 1

What is the role of human operator?

Question 2

What is an operating systems?

Answer 2

• An Operating System is a program or collection of programs that makes it easier for us to use a computer.
• Operating provides simpler abstraction of the underlying hardware.
• An operating system is resource manager
• It is a layer of system software that acts as an intermediary between a computer user and the computer’s hardware.

Question 3

What are the examples of an operating system?

Answer 3

1. DOS,OS/2, Window XP
2. FreeBSD,Fedora, Solaris,Mac OS
   3.iOS, Android, Symbian OS

Question 4

How does the operating system work from the user’s perspective?

Answer 4

It is designed for ease of use - it hides the hardware complexity:

1. Exciting user program
2. Convinent interface

Question 5

What is the operating system like from the perspective of the system?

Question 6

What are the objectives of an operating systems?

Answer 6

• A program that controls the execution of application programs
• An interface between applications and hardware

Question 7

What is the main objectives of an OS?

Answer 7

• Convenience
• Efficiency
• Ability to evolve

Question 8

What are the components found in a computer system and explain its functions?

Answer 8

1. Hardware: basic computing resources
2. Operating system: controls and coordinates use of hardware amongst applications and users
3. Application Programs: Used to solve computing problems such as compilers, text editors, email clients etc.
4. Users: people, machines and other computers

Question 9

What are the services in the operating system?

Question 10

What is the role of an operating system?

Answer 10

• A computer is a set of resources for the movement, storage, and processing of data and for the control of these functions.
• The OS is responsible for managing these resources.

Question 11

What is the operating system as a resource manager?

Question 12

What is the evolution of the OS?

Answer 12

1. Serial Processing
2. Simple Batch Systems
3. Multi programmed batch systems
4. Time sharing systems

Question 13

What were the problems associated with serial processing in the earliest computers?

Answer 13

1. Scheduling - Most installations used a hard copy sign-up sheet to reserve computer time. Time allocations could run short or long, meaning computer time is wasted.
2. Setup time - Considerable amount of time was spent just on setting up the program to run

Question 14

In the earliest computers, what was were the features?

Answer 14

1. There was no operating system, this means programmers interacted directly with the computer hardware
2. Users have access to the computer in “series.”
3. Computers ran from a console with display lights,toggle switches, som from of input devices, and a printer.

Question 15

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