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Definition of OS – Operating System

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Definition of OS

OS was not in existence in the 1940s when they launched the first commercial form of an electronic computer but mechanical switches are what was in existence which they used to program. Also, Programming languages were not in existence then.
OS was developed in order to facilitate hardware usage. OS makes the provision of a suitable interface for the use of the computer system.
When OS is not in existence user needs to write the machine-level programme before they can operate the hardware.

OS have makes a user to use the computer easily without directly programming the hardware. OS provides a platform which allows computer software to runs.

Definition of Os
Among all other system software, OS has much task to performs especially managing the output and input devices, manipulating file systems etc. The application is the user of an OS and no user interface for OS.
Some of the most Popular OSs are Linux, Windows, Mac OS.
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The Zeroth Generation

The zeroth generation was the period when there was no OS. This period was in the mid-1800s till 1951 when the first generation come into existence.
Electronic vacuum tubes were the hardware component technology that was being used during that period.
The machine’s set up and the operation was in the responsibility of the individual programmer. It operates on a mode called “Open-Shop”

The First Generation (1951 – 1956)

The OS come into existence in the first generation. It was characterized by its appearance on how it runs tasks. It was called “Closed Shop”.
The OS support the running of an application programme one at a time. The system was still under the control of the human operator.

The Second Generation (1956 – 1964)

The second generation was characterized by its changes of the hardware components technology which were not present in the first generation were transistors replace electronic vacuum tubes.

The Third Generation (1964 – 1979)

There were changes in the third generation’s component technology that makes it much different from the second generation.
The use of ICs was introduced in the third generation.
IBM introduces its OS 360 which was the third generation. The OS introduces the programme of reading and writing (i.e. reading from devices as in inputting and writing on devices as in outputting).

The Fourth Generation (1979 – Present)

The personal computer and the workstation were used to characterize the fourth generation. The fourth generation comes with the replacement of the third generation using very large scale integration (VLSI).
The mode called “open shop” reflects on the fourth generation that was in use in the pre-operating system period. It supports multi-programmes to run at the same time.
the authorEmmanuel

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