Page 89 - Ai_417_V3.0_C9_Flipbook
P. 89

Some of the operating systems are explained below:

                 UNIX

                 Unix is one of the oldest, reliable, and powerful Operating Systems developed at AT&T’s Bell
                 Laboratories in the early 1970’s. It has a simple user interface called Shell, which interacts with
                 the kernel to execute tasks. Some of its important features are:
                    • It has a character user interface.                                                        Unix
                    • It supports multiuser and multitasking. Several users can run multiple programs or processes
                   simultaneously on one system.
                    • It has machine independent architecture written in high level language.
                    • It has a hierarchical file system to represent information.


                 Disk Operating System (DOS)

                 After  UNIX,  DOS is one  of the  most commonly used Operating  Systems. It was  written originally  by
                 Tim Patterson— Father of DOS and owned by Seattle Computer Products. Microsoft released it with an IBM PC as
                 MS-DOS 1.0 in 1982. It has the following important features:




















                                                                   DOS
                    • It is a single-user operating system.
                    • The user interacts with the OS in a text mode environment.
                    • It does not support a graphical interface, so the mouse cannot be used as an input device.
                    • Basic file management functions like creating, renaming, copying, moving, deleting, etc. can be easily performed
                   at “Command Prompt”.

                 Windows

                 The first version of Windows, launched by Microsoft in 1985 which
                 was an extension of the Disk Operating System. The most important
                 change is the support of Graphical User Interface where mouse as
                 an input device played a very important role. Following are some of
                 its important features:
                    •  Initial versions supported single user at a time but now new versions
                   support both single user and multi users at a time.
                    • It has multitasking features.
                    • It has a Graphical User Interface where the user can get its work
                   done by a few simple mouse clicks.
                    • It provides easy access to the Internet.

                                                                                                  ICT Skills-I  87
   84   85   86   87   88   89   90   91   92   93   94