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1 Chapter 2 Operating Systems: Software in the Background
2/26 What is an Operating System? Set of programs between application software and hardware
3/26 Operating System Definitions Kernel – main program Booting
4/26 Functions of an Operating System Manage computer’s resources User interface Services for application software
5/26 Basics of a Personal Computer Operating System Platform Operating system Hardware Application software is platform specific
6/26 Comparing User Interfaces Command line Text based User must memorize commands Graphical user interface Icons Mouse Nothing to memorize
7/26 Home/Consumer Market Windows 95 and Windows 98 Plug and Play Object Linking and Embedding (OLE) Long file names Internet browsing DVD Wizards Utilities
8/26 Home/Consumer Market Windows Me More multimedia support Restores system files Automatic updates Home network wizard
9/26 Corporate Market Windows NT Network environment Stronger security features NT workstation and NT server
10/26 Corporate Market Windows 2000 Windows NT and Windows 98 Personalized preferences Windows 2000 Professional and Windows 2000 Server
11/26 Windows XP Extends Windows Me More stable environment Network Server Desktop Computer Professional Client Personal Client
12/26 Windows CE Subset of Windows Embedded Systems Pocket computers Internet connectivity
13/26 Other Operating Systems Mac OS UNIX LINUX
14/26 Network Operating Systems Sharing of resources Data security Troubleshooting Administrative control
15/26 Operating Systems for Large Computers Mainframes Used by many people at once Several programs in memory Special problems
16/26 Sharing the CPU Multiprocessing Multiple CPUs Each CPU with one program Programs run simultaneously
17/26 Sharing the CPU Multiprogramming Multiple programs Programs run concurrently Event-driven Interrupts
18/26 Sharing the CPU Time-sharing Multiple users Time-driven Time slice
19/26 Memory management Partitions or regions Foreground Background
20/26 Memory Management Virtual storage Paging Page table Thrashing Memory protection
21/26 Resource Allocation Sharing storage resources Sharing printing resources Spooling
22/26 Utility programs File manager allows you to view directories allows copy, move, rename, delete, etc. Windows Explorer
23/26 Utility programs Device drivers Backup and restore File compression WinZip
24/26 Utility programs Defragmenter
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