1) Interface between uses and computer
2) Master control progra3) Manages the I/O operations
4) Allocating the resources
5) Tracking the use of resources
6) File and disk Management
7) Detects and notifies the errors.
Operating System Environments:
Multiprogramming
- Multiple uses can run multiple programs on a single CPU Computer at the same time.
- The CPU switches between the programs.
- Similar to the Time Sharing
Multiprocessing
- Multiprocessing system has a number of processors that process data and instructions.
- Ideally required for complex operations.
1. Operating System is an integrated set of specialized programs that is used to manage the resources and overall operation of a computer.
2. An operating system is a program that works behind the scene when an application software and utility software is running.
3. The following are the main functions of OS:-
· It controls all the equipments connected to the main machine.
· The operating system server has two very important functions in the modem PC. First, an OS interface with, and provides an extension to the BIOS. The extension provides application with a rich relate of high level file handling and disk control functions. In actual operation, the OS and BIOS work closely together to give an application access to system resources.
· Operating system enables uses to make efficient Use of the computing facilities for solving their problems. These programs manages the resources of a computer system, Automate its operation, an make easier the writing, testing and debugging of users programs.
· The operating system acts as a link between use and the computer hardware ultimately a computer system works using binary signal (i.e. 1a and 0s). Actually on OS hides the complexities of the computer from the user. The OS means that you do not have to work directly with binary arithmetic.
