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Operating Systems

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Introduction

Operating Systems Windows 3.1 Windows NT Windows Long Horn Windows XP Other Windows Operating Systems: Windows 98 Windows 95 Windows ME Windows 2000 How an Operating System Works Any desktop or laptop PC that you buy normally comes pre-loaded with Windows XP. Macintosh computers come pre-loaded with OS X. Many corporate servers use the Linux or UNIX operating systems. An Operating System could be found in smaller devices also. For example a Mobile Phone. The purpose of an operating system is to organize and control hardware and software. I a PC it controls things like the CPU, hard drive and memory etc. In simpler systems, like mobile phones the operating system could control the keypad and battery or the connection to the service provider. Its also provides a stable, consistent way for applications to deal with the hardware without having to know all the details of the hardware. An operating system is mainly designed to be a task manager. ...read more.

Middle

Drivers are separate from the operating system so that new functions can be added to the driver and to improve the performance of the hardware. Managing all the resources of the computer system is a large part of the operating system's function. Processor Management The processor management makes sure that the applications receive enough of the processor's time to function properly. Also it makes sure that the processor is used as much as possible for real work in each cycle. The operating system does this by scheduling the work done by the processor. In a multi-tasking operating system, for example Windows XP. The processor management runs to give the appearance that the CPU is doing more than one thing at a time. This is not true. In order to give the appearance of lots of things happening at the same time, the operating system has to switch between different processes thousands of times a second. Here's how it happens: � A process occupies a certain amount of RAM. ...read more.

Conclusion

is what is displayed on the monitor. A GUI is the graphical user interface to a computer, and its elements include such things as: windows, icons, and buttons, cursors and scroll bars. This is an output user interface. The user interfaces are vital for the computer to be used by a human. Memory and File Management Everything the computer does is at some time written to the RAM by the operating system. For the operating system to be able to do this, firstly memory boundaries must be set up for individual applications, which will be stored in the RAM. When the allocated space in the RAM is full, and the processor is not using the information stored there it is then moved by the operating system to the hard disk in what is called Virtual Memory. Hard disk storage is only one of the memory types that must be managed by the operating system, and is the slowest compared to other storage types. The object of the operating system is to balance between what is and isn't needed it the RAM and prepare the RAM so the processor can use it trouble free. Kris Littlewood - 1 - ...read more.

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