TAILIEUCHUNG - Introduction to Computing (17)

CSC to Computing Lecture 17 Dr. Iftikhar Azim Niaz. ianiaz@. 1Last Lecture System Operating Functions of Operating System. q Start and Shut down. q Providing a User Interface. q Managing programs. q Managing memory. q Coordinated tasks and Configure devices. q Internet connections, Monitor Performance. q Providing Utilities and automatic Update. q Control a network and Administrator Security. 2 Operating System Over past 30 years, the evolution in OS has. made PCs. q easier to use and understand. q more flexible and more Many of the first operating systems were. device dependent and A device-dependent program is one that runs. only on a specific type or make of Proprietary software is privately owned and. limited to a specific vendor or computer model. q Some OS still are device dependent. 3 Operating System A device-independent OS is one that run on. computers provided by a variety of. manufacturers. q Advantage is you can retain existing application soft. ware and data files even if you change computer. models or As new versions of the OS are released, users. upgrade their existing computers and mobile. devices to incorporate features of the new. Purchasing an OS upgrade usually costs less. than purchasing the entire operating system 4Types of Operating Systems. Windows Version Year Released Windows 1990. Windows NT 1993. Windows 95 1995. Windows NT Workstation 1996. Windows 98 1998. Windows Millennium Edition 2000. Windows 2000 Professional 2000. Windows XP 2001. Windows XP SP2 2004. 5 Stand Alone Operating Stand-alone OS is a complete OS that works. on a desktop computer, notebook computer, or. mobile computing devicen Some stand-alone OS are called Client OS. because they also work in conjunction with a. server operating system q Client OS can operate with or without a DOS, Windows , Windows 95, Windows 98,. windows 2000, Windows Vista, Windows XP,. Windows 7, Mac OS X, Unix, Linux 6 Disk Operating System (DOS).n Single user single-tasking Two popular version. q PC DOS, which IBM released with its computers. q MS DOS, which was used on millions of “IBM-. compatible” Command line interface and completely text. 16-bit OS, Functions include. q monitor support, disk input and output, keyboard. control and internal functions related to program. execution and file maintenance. 7 Disk Operating System (DOS).n Advantages. q Requires small memory as it is small in size. q Fast and powerful. q Easy to use. q Supports legacy Weaknesses. q Single user single task. q No built-in support for networking. q Manual Installation of device-drivers. q Supports only 16 Bit programs. q Address limited amount of Memory and storage. q Command Line interface 8DOS Application. 9Microsoft Windows 1990 ­ 2000. 10Microsoft Windows 2000 ­ 2009. 11 W

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