Different Operating Systems

  Operating System or OS -- is  software,consisting of programs and data, that  runs on computers, manages computer  hardware resources, and provides common  services for execution of various application  software. The operating system is the most  important type of system software in a  computer system. Without an operating system,  a user cannot run an application  program on their computer, unless the  application program is self booting.

 

•An OS has brand Name

•Each Brand has different versions of OS

•Can anyone name a brand name of an OS?

•Common Brands.  Windows or Mac 

•Others:  UNIX / Linux, Google Chrome OS, Novel 

•Before Windows, Microsoft used Dos.  Dos was a non- GUI OS (Graphical User Interface) 

•Window versions: Windows CE, Windows 3.x, Windows 95, Windows 98, Windows 98 SE, Windows ME, Windows NT, Windows 2000, Windows XP, Windows Vista, Windows 7

•Mac versions: Apple DOS 3.1, Apple System 1-7, Mac OS 8, Mac OS 9, Mac OS 10, Mac OS X 

•Unix/Linux got its start in 1957-- Bell Labs found they needed an operating system for their computer center that at the time was running various batch jobs. The BESYS operating system was created at Bell Labs to deal with these needs. 

•Unix/Linux has many variations or brands that have evolved since then 

•Brands: BSD, FreeBSD, SCO/Caldera, Red Hat, Solaris, Linux 

•Linux was not started until 1991, but it is the most noted UNIX

OS

•Today’s computers are:
 

1.Multi-user - A multi-user operating system allows for multiple users to use the same computer at the same time and different times.

2.Multiprocessing - An operating system capable of supporting and utilizing more than one computer processor.

3.Multitasking - An operating system that is capable of allowing multiple software processes to run at the same time.

4.Multithreading - Operating systems that allow different parts of a software program to run concurrently. 

•Operating System or OS -- is software, consisting of programs and data, that runs on computers, manages computer hardware resources, and provides common services for execution of various application software. The operating system is the most important type of system software in a computer system. Without an operating system, a user cannot run an application program on their computer, unless the application program is self booting.  

•Operating System or OS -- is software, consisting of programs and data, that runs on computers, manages computer hardware resources, and provides common services for execution of various application software. The operating system is the most important type of system software in a computer system. Without an operating system, a user cannot run an application program on their computer, unless the application program is self booting.