Operating System Basics

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Operating System Basics

Functions of Operating Systems
• An operating system is the software on a computer that manages the way different programs use its hardware, and regulates the ways that a user controls the computer. • Provide a user interface

• Run programs
• Organized file storage

Types of Operating Systems
• Real-time operating system
– Very fast small OS
– Built into a device
– Respond quickly to user input
– MP3 players, Medical devices
• Single user/Single tasking OS
– One user works on the system
– Performs one task at a time
– MS-DOS (MicroSoft Disk Operating System) and Palm OS – MS-DOS is an operating system for x86-based (Intel 8086 microprocessor) personal computers, which was purchased by Microsoft. It was the most commonly used member of the DOS family of operating systems, and was the main operating system for personal computers during the 1980s up to mid 1990s. It was gradually replaced on consumer desktop computers by operating systems offering a graphical user interface (GUI), in particular by various generations of the Microsoft Windows operating system. – Palm OS (also known as Garnet OS) is a mobile operating system initially developed by Palm. for personal digital assistants (PDAs) in 1996. Palm OS is designed for ease of use with a touchscreen-based graphical user interface. It is provided with a suite of basic applications for personal information management. – Take up little space on disk

– Run on inexpensive computers
• Single user/Multitasking OS
– User performs many tasks at once
– Most common form of OS
– Windows XP and OS X
– Require expensive computers
– Tend to be complex
• Multi user/Multitasking OS
– Many users connect to one computer
– Each user has a unique session
– UNIX, Linux, and VMS...
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