Page 51 - IT 402 v2.0 class 10
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he programs that make up the operating system are:

            Control Program: It controls and manages all the hardware and memory resources of the computer system. It
            regulates the activities of the     and allocates memory space whenever re uired. It coordinates to schedule
            the data to be received or sent through input and output devices.

            Supervisory Program:  he supervisory program controls operations of operating system and application
            programs.
            Service Program:  he service program enables proper interaction which provides service to the users. For
            example  the set of programs that help to save files and load them from   s.

               CLASSIFICATION OF OPERATING SYSTEM

             e will now learn about various classifications of operating systems.

            On the basis of Interface

            On the basis of Interface  Operating Systems can be classified as:
              CUI (Character User Interface): In   I operating system  the user sends commands and instructions to
              the computer in character form  i.e.  by typing commands at the command prompt.  he display on the
              screen does not contain any graphic or picture  rather it contains only lines and characters.  xamples are
                - OS  MS- OS and  NI .
              GUI (Graphical User Interface): In this operating system  the interface is graphical  i.e.  the user interacts
              with figures and graphs on the screen. It is basically menu or button based.   user can use options of the
              menu to execute different functions.   I operating systems are interactive and user friendly.  xamples
              are  indows      indows  ista   indows     indows     indows  .    indows      indows      IN
                edhat   buntu   OSS  etc .

            On the basis of Number of Users

            On the basis of number of users  Operating Systems can be classified as:
              Single-user:   single-user operating system provides access to a single user at a time. For example  MS- OS.

              Multi-user: Some operating systems allow access to two or more users to run the same programs at the
              same time on a network. Some operating systems permit hundreds or even thousands of concurrent users.
              For example   inux   nix  etc.
            On the basis of Processing

            On the basis of  rocessing  Operating Systems can be classified as:
              Uniprocessing:  his type of operating systems allow single processing on a single processor  i.e.  only one
              program at a time.
              Multiprocessing:   his  type  of  operating  system  supports  simultaneous  processing  of  more  than  one
              program.

             t er  lassifications
             et us now learn about other classifications of operating systems.
              Multitasking (Time sharing): Such operating systems allow the computer to work on more than one
              application by switching among them.  he switching occurs so fre uently that the user can interact with
              each program conveniently.





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