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What are the three types of devices manged by operating system explain virtual dedicated sharing?
types of devices in operating system
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certain folder on which the critical data of system is stored cannot be shared because if someone change that this may cause problems.
virtual devices in os
examples of all os
Hi, I am glad to see this nice question, i will explain you by example. so that you can very easily understand what exactly is the operating system is. Let us take an exam…ple of a car. the motive behind designing a car is to get the ability to travel from one place to other. but the car is obsolute hardware.you need to have some way to get start it, accelerate it, stop it, turn it. etc.for that reason various contols are present in the car.an ignition system is designed to let you start the car. steraing is designed to let you turn your car as your way of direction,break is designed to stop the car wherever you want. so by means of these various control set you actually operate the car. you can call this set of controls of car as an operating system of car. without these controls, there is no way for you to use this car. similarly, computer hardware is designed to do much more complex work. for example, your computer let you type and save the work in file. you can do this because there is one componant of OS which is called fie system is available for you. which let you save the information into the computer hard disk. this is one example, computer can do lots of things.but we need some way to get it done by computer. here is where the operating system comes into the picture. the basic operation of saving information on disk using a file, can be utilized to develop and application software which can hold specific data for specific usage. for example, doctors may have one application which saves patient history in file and then hard disk. musician may save his compositions in file and then hard disk. like this everybody is using a basic service of saving and retriving information on the hard disk using a file. because operating system is providen file system service to any other installed program.may it be doctors or musicians. hope you got it. Examples of Operating Systems Microsoft WindowsApple Mac OSUbuntu LinuxGood Android
Dedicated devices are devices that are assigned to only 1 job at a time and serves the job for the entire time it is active. eg. Printers, tape devices, plotters
when several processes can use a device at the same time then those devices are termed as shared devices.
Time-sharing is sharing a computing resource among many users by means of multiprogramming and multi-tasking. Its introduction in the 1960s, and emergence as the prominent… model of computing in the 1970s, represents a major technological shift in the history of computing. By allowing a large number of users to interact concurrently with a single computer, time-sharing dramatically lowered the cost of providing computing capability, made it possible for individuals and organizations to use a computer without owning one, and promoted the interactive use of computers and the development of new interactive applications.
An operating system which is run on server but is assessed/interacted with by a terminal.
mobile phones, laptops,computers,modern tv's and of course computers aswell as tablets
Operating System Functions What is an Operating SystemThe operating system is the core software component of your computer. It performs many functions and is, in very b…asic terms, an interface between your computer and the outside world. In the section about hardware, a computer is described as consisting of several component parts including your monitor, keyboard, mouse, and other parts. The operating system provides an interface to these parts using what is referred to as "drivers". This is why sometimes when you install a new printer or other piece of hardware, your system will ask you to install more software called a driver. What does a driver do?A driver is a specially written program which understands the operation of the device it interfaces to, such as a printer, video card, sound card or CD ROM drive. It translates commands from the operating system or user into commands understood by the the component computer part it interfaces with. It also translates responses from the component computer part back to responses that can be understood by the operating system, application program, or user. The below diagram gives a graphical depiction of the interfaces between the operating system and the computer component. | Other Operating System FunctionsThe operating system provides for several other functions including:System tools (programs) used to monitor computer performance, debug problems, or maintain parts of the system.A set of libraries or functions which programs may use to perform specific tasks especially relating to interfacing with computer system components. The operating system makes these interfacing functions along with its other functions operate smoothly and these functions are mostly transparent to the user. Operating System ConcernsAs mentioned previously, an operating system is a computer program. Operating systems are written by human programmers who make mistakes. Therefore there can be errors in the code even though there may be some testing before the product is released. Some companies have better software quality control and testing than others so you may notice varying levels of quality from operating system to operating system. Errors in operating systems cause three main types of problems:System crashes and instabilities - These can happen due to a software bug typically in the operating system, although computer programs being run on the operating system can make the system more unstable or may even crash the system by themselves. This varies depending on the type of operating system. A system crash is the act of a system freezing and becoming unresponsive which would cause the user to need to reboot.Security flaws - Some software errors leave a door open for the system to be broken into by unauthorized intruders. As these flaws are discovered, unauthorized intruders may try to use these to gain illegal access to your system. Patching these flaws often will help keep your computer system secure. How this is done will be explained later.Sometimes errors in the operating system will cause the computer not to work correctly with some peripheral devices such as printers. Operating System TypesThere are many types of operating systems. The most common is the Microsoft suite of operating systems. They include from most recent to the oldest:Windows XP Professional Edition - A version used by many businesses on workstations. It has the ability to become a member of a corporate domain.Windows XP Home Edition - A lower cost version of Windows XP which is for home use only and should not be used at a business.Windows 2000 - A better version of the Windows NT operating system which works well both at home and as a workstation at a business. It includes technologies which allow hardware to be automatically detected and other enhancements over Windows NT.Windows ME - A upgraded version from windows 98 but it has been historically plagued with programming errors which may be frustrating for home users.Windows 98 - This was produced in two main versions. The first Windows 98 version was plagued with programming errors but the Windows 98 Second Edition which came out later was much better with many errors resolved.Windows NT - A version of Windows made specifically for businesses offering better control over workstation capabilities to help network administrators.Windows 95 - The first version of Windows after the older Windows 3.x versions offering a better interface and better library functions for programs. There are other worthwhile types of operating systems not made by Microsoft. The greatest problem with these operating systems lies in the fact that not as many application programs are written for them. However if you can get the type of application programs you are looking for, one of the systems listed below may be a good choice.Unix - A system that has been around for many years and it is very stable. It is primary used to be a server rather than a workstation and should not be used by anyone who does not understand the system. It can be difficult to learn. Unix must normally run an a computer made by the same company that produces the software.Linux - Linux is similar to Unix in operation but it is free. It also should not be used by anyone who does not understand the system and can be difficult to learn.Apple MacIntosh - Most recent versions are based on Unix but it has a good graphical interface so it is both stable (does not crash often or have as many software problems as other systems may have) and easy to learn. One drawback to this system is that it can only be run on Apple produced hardware.
An operating system (OS) is software, consisting of programs and data, that runs on computers, manages computer hardware resources, & provides common services for execution of… various application software. For hardware functions such as input & output and memory allocation, the operating system acts as an intermediary between application programs & the computer hardware. Operating systems are found on almost any device that contains a computer from cellular phones and video game consoles to supercomputers and web servers. Examples of popular modern operating systems for personal computers are: Mac OS X, Microsoft Windows & Linux.
The combination of dedicated devices and shared devices those devices are called as vertual devices.
Types of shares A company may have many different types of shares that come with different conditions and rights. There are four main types of shares: Ordinary shares ar…e standard shares with no special rights or restrictions. They have the potential to give the highest financial gains, but also have the highest risk. Ordinary shareholders are the last to be paid if the company is wound up. Preference shares typically carry a right that gives the holder preferential treatment when annual dividends are distributed to shareholders. Shares in this category receive a fixed dividend, which means that a shareholder would not benefit from an increase in the business' profits. However, usually they have rights to their dividend ahead of ordinary shareholders if the business is in trouble. Also, where a business is wound up, they are likely to be repaid the par or nominal value of shares ahead of ordinary shareholders. Cumulative preference shares give holders the right that, if a dividend cannot be paid one year, it will be carried forward to successive years. Dividends on cumulative preference shares must be paid, despite the earning levels of the business, provided the company has distributable profits. Redeemable shares come with an agreement that the company can buy them back at a future date - this can be at a fixed date or at the choice of the business. A company cannot issue only redeemable shares.
in multiprogramming system, when two or more user use program or file at same time. the MMU of OS share pages of the process with the users. these pages is called shared pages…