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Operating Systems. * Section A: Introduction. * Section B: The importance of the operating system. * Section C: Types of operating systems. * Section D: Operating system functions. * Section E: Examples of the operating system. Introduction.

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Operating Systems

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    1. Operating Systems * Section A:Introduction *Section B:The importance of the operating system *Section C: Types of operating systems *Section D: Operating system functions *Section E: Examples of the operating system

    2. Introduction • Operating system is a set of computer programs that manage the hardware resources and software for the computer system.We can add to that definition to say that an operating system rationally processes electronic devices in response to approved commands. We can add to this definition to say that the operating system rationally operations of electronic devices in response to orders adopted.

    3. Introduction • At the foundation of all system software, an operating system performs basic tasks such as controlling and allocating memory, prioritizing system requests, controlling input and output devices, facilitating networking, and managing file systems. On the basis of all system software, operating system performs basic tasks such as controlling and allocating memory, prioritizing system requests, controlling input and output devices, facilitating networking and managing file systems.

    4. The importance of the operating system • 1) operating system controls the computer and work on the link between a computer and the user. • 2) the greater the complexity of the operating system the greater the effectiveness of this system and reduces the cost of the use of additional facilities to the network

    5. Types of operating systems • • (Real Time Operating System RTOS): • operating systems designed for quick control machinery scientific instruments and industrial systems. The RTOS model and the possibility of a user interface is very small, no facilities and benefits to the user. By the fund will be closed when the system delivers to use. A very important part of the RTOS is to manage computer resources in order to implement a specific process in the same amount of time as filling. In complex machines, and a part moves more quickly because the system resources available may be as tragic when this part is not moving at all because the system is busy.

    6. Types of operating systems • • (Single-User & Single-Task): As the name suggests, this system is designed to manage the computer so that it can serve a single user one thing at a time and effectively. Examples of the operating system (MS-DOS).

    7. Types of operating systems • • (Single-User & Multi-Task): • This is the type of operating system that most users use it in their PCs and laptops today. Windows 98 and Macintosh example of a combination of both the operating system in question, which allows one user to the implementation of several programs running at the same time. For instance, it is possible for a user and Windows 98 to write a letter in a text editor while loading the file from the Internet at the same time, prints the text of the e-mail message on the printer.

    8. Types of operating systems • • (Multi-User): • an operating system allows multiple users to many different users to take advantage of computer resources at the same time. Should ensure that the operating system that the demands of diverse users and are balanced, and that each of the programs that use them adequate resources and separate so as not to affect the problem of a users profile on the community of users. UNIX and VMS operating systems such as computers Aloiwanip MVS. Are examples of multiple operating systems employed.

    9. Operating system functions • Of the functions of the operating system is also linked with some of the computers in the work of a local network or the Internet and this is what is called the networkIs to make your computer interacts with the user so that carrying out orders sought by the user and the computer language that is understood by the operating system of the machine is nothing but an intermediary between the user and the machine where the user types the command that he wants in his own language shall transfer the operating system language understandable to the machine language that is understood by the device

    10. Examples of the operating system • Examples of operating system processes as follows:Disk access Keyboard Input Mouse Input Screen Output