Unit I Fundamentals of Computers . Application Software Operating System Hardware User Figure: . Interaction of Operating system and user Uses of Operating Systems The following are few uses of Operating System The main use of Operating System is to ensure that a computer can be used to extract what the user wants it do. Easy interaction between the users and computers.
Starting computer operation automatically when power is turned on (Booting). Controlling Input and Output Devices Manage the utilisation of main memory. Providing security to user programs. .
Types of Operating System Operating System are classified into the following types depending on their processing capabilities. . . Single User Operating Systems An operating system allows only a single user to perform a task at a time.
It is called as a Single user and single Task operating system.MS-DOS is an example for a single user and single task Operating System. . . Multi-user Operating Systems It is used in computers and laptops that allow same data and applications to be accessed by multiple users at the same time.
The users can also communicate with each other. Windows, Linux and UNIX are examples for multi-user Operating System. . Key features of the Operating System The various key features are given below User Interface Memory Management Fault Tolerance Key Features of Operating System File Management Process Management Security Management Figure: .
Key Features of the Operating System . . User Interface (UI) User interface is one of the significant feature in Operating System. The only way that user can make interaction with a computer.
This is a main reason for key success of GUI (Graphical User Interface) based Operating System. The GUI is a window based system with a pointing device to direct I/O, choose from menus, make selections and a keyboard to enter text.Its vibrant colours attract the user very easily. Keeping track of which portion of memory are currently being used and who is using them. Determining which processes (or parts of processes) and data to move in and out of memory.
Allocation and