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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.
DOS
It has the following important features:
• 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. Windows 11
86 Trackpad Information Technology (Ver. 1.0)-IX

