Computer Applications Secondary Level: Unit-1: Prologue to Computer Learning Outcomes:

Prologue to Computer
Learning Outcomes:

After culmination of this unit you will actually want to
  • To make sense of/portray the ideas of PC.
  • To make sense of/depict history of PC.
  • To make sense of/depict PC framework qualities.
  • To make sense of/depict the kinds of PC.

1.1. The Concept of Computer

The present world is a data rich world and it has turned into a need for everybody to be familiar with PCs. PC is a high level electronic gadget that accepts crude information as a contribution from the client and cycles it heavily influenced by a bunch of guidelines (called program), creates an outcome (result), and saves it for sometime later. This unit makes sense of the central ideas of PC equipment, programming, working frameworks, peripherals, and so forth alongside how to get the most worth and effect from PC innovation.

A PC is an electronic information handling gadget, which acknowledges and stores information input, processes the information input, and creates the result in a necessary configuration.

Or on the other hand

A PC is an electronic machine that acknowledges the information and directions from the client, processes the information as indicated by the given arrangement of guidelines, stores and gives the data (result).

Functionalities of a Computer

On the off chance that we take a gander at it in an extremely expansive sense, any computerized PC does the accompanying five capabilities −

Stage 1 − Takes information as information.

Stage 2 − Stores the information/directions in its memory and utilizations them as required.

Stage 3 − Processes the information and converts it into helpful data.

Stage 4 − Generates the result.

Stage 5 − Controls every one of the over four stages.

1.2. History of Computers

Assuming we see the PC from the past to introduce, we can see that they don't have comparative innovation, shape, size, usefulness and so forth. In this way, the current PC that we use contrasts from the past PC. The beginning of PC begins from counting. A short portrayal about the improvement interaction of PC is depicted underneath:

Mechanical Devices


Quite a long time back when men began to count the numbers, they thought about a gadget which can follow the numbers and hence came the presence of ABACUS. It was the principal including gadget which was created in China over a long time back. The name Abacus was acquired from Greek word Abax which implies chunk. This gadget fundamentally comprises of a rectangular wooden casing and dabs. The casing is partitioned into two sections and pillar isolates these parts. The upper part is called paradise and the lower part is called earth. The casing contains flat poles and the dots which have openings are gone through the bars. Counting was finished by moving the dots from one finish of the casing to the next.

Napier 's Bones:

It is a gadget which contains a bunch of poles made of bones. It was created by John Napier in 1617, a Scottish Mathematician and subsequently the gadget was named as Napier's bones. The gadget was predominantly created for performing augmentation and division. In 1614, he additionally presented logarithms.

Slide Rule:

Slide Rule was a simple gadget imagined by William Oughtred in 1620. The slide rule is utilized primarily for increase and division, and furthermore for "logical" works like roots, logarithms and geometry, however generally not really for expansion or deduction. The slide rule depends on the work on logarithm. A basic slide rule comprises of two mobile checked scales in which one scale slips upon the other.


Pascaline is a working out machine created by Blaise Pascal in 1642, a French Mathematician. It was the primary gadget with a capacity to perform increases and deductions on entire numbers. The gadget is comprised of interlocked pinion wheels which contains numbers 0 to 9 on its outline. At the point when one wheel finishes its revolution the other wheel moves by one fragment. Pascal licensed this gadget in 1647 and created it on mass scale and brought in a small bunch of cash.

Stepped Reckoner:    

Ventured Reckoner a computing machine planned (1671) and fabricated (1673) by the German mathematician-rationalist Gottfried Wilhelm von Leibniz. The Stepped Reckoner developed the French mathematician-rationalist Blaise Pascal's thoughts and did duplication by rehashed expansion and moving. It was the main mini-computer that could perform-expansion, deduction, duplication and division. Indeed, even square roots could be determined by series of ventured increases.

Jacquard's Loom:

Jacquard's Loom was imagined by Joseph Jacquard and first showed in 1801. This gadget is a connection for controlled looms that utilizes a chain of punch cards to teach the loom on the best way to make multifaceted materials. For instance, a loom could have many cards with openings in every one of them that relate to snares that can be raised or brought down to make a material brocade. The following is a representation of the Jacquard Loom connection on top of a material loom.

Charles Babbage and his Engines:

Charles Babbage was brought into the world on December 26, 1791 in London, England. He planned the principal mechanical PC, which he called the "Distinction Engine" — a machine that could settle polynomial conditions without utilizing increase or division. He started fostering the machine in 1822, and dealt with it for more than decade, yet its development was rarely finished.
  • He additionally created and fostered his Analytical Engine in the late 1833. This was the principal broadly useful completely programmable mechanical machine. This gadget could perform complex computations and store the outcome.
  • This insightful motor depended on information, interaction and result rule since the cutting edge PCs depend on Babbage's thought and standard. Thusly, Charles Babbage is otherwise called the dad of present day software engineering.

Lady Augusta Ada Lovelace:

Lady Augusta Ada Lovelace was an English essayist also girl of well known English writer Lord Byron. She recommended Charsles Babbage to involve paired number framework for projects and information to be taken care of into the Analytical Engine. That was the principal programming idea. Thus, she is viewed as the world's most memorable software engineer. In 1979, the US Department of Defense fostered a programming language and named 'ADA' in her honor.

Tabulating Machine:

The Hollerith arranging machine, otherwise called the classifying machine, was an electrical counting machine created by Herman Hollerith. It was first depicted in quite a while doctoral postulation, which he introduced at Columbia University in 1889. The machine was confirmation of his idea that information could be encoded by openings punched in a card and in this manner counted and arranged electronically. It was fruitful, and Hollerith happened to establish the Tabulating Machine Company, which later converged to turn into an organization called IBM.

Electromechanical Computer (Devices):

Mark I:

Mark I was planned by a Harvard graduate understudy, Howard H. Aiken in 1937 to tackle progressed numerical material science issues experienced in his examination. The IBM Automatic Sequence Controlled Calculator (ASCC), called Mark I, utilizes 18000 vacuum cylinders to store information in the memory. The machine weighed 35 tones, 500 miles of wire, 8 feet tall and 51 feet in length and so forth.

Atanasoff-Berry Computer:

Atanasoff-Berry Computer (the ABC) is considered as the principal electronic advanced PC and was the main machine to utilize vacuum tubes (more than 300 vacuum tubes). Teacher John Vincent Atanasoff and graduate understudy Cliff Berry fostered the ABC in 1937 and proceeded with advancement until 1942 at the Iowa State College (presently Iowa State University). On October 19, 1973, Judge Earl R. Larson marked his decision that the ENIAC, patent by Eckert and Mauchly was invalid and named Atanasoff the innovator of the principal electronic advanced PC.

Electronic Computers (Devices):


Electronic Numerical Integrator and Calculator, (the ENIAC) was the primary electronic PC utilized for general purposes, like tackling mathematical issues. It was created by J. Presper Eckert and John Mauchly at the University of Pennsylvania to ascertain big guns shooting tables for the United States Army's Ballistic Research Laboratory. Its development started in 1943 and was not finished until 1946. In spite of the fact that it was not finished for the rest of World War II, the ENIAC was made to assist with the conflict exertion against German powers. In 1956, the finish of its activity, the (ENIAC) involved around 1,800 square feet and comprised of very nearly 20,000 vacuum tubes, 1,500 transfers, 10,000 capacitors, and 70,000 resistors. It additionally utilized 200 kilowatts of power, weighed north of 30 tons, and cost about $487,000.


Electronic Delay Storage Automatic Calculator (EDSAC) is an early British PC viewed as the principal put away program electronic PC. It was made at the University of Cambridge in England, played out its most memorable computation on May 6, 1949, and was the PC that ran the primary graphical PC game, nicknamed "Child." In the image to one side, is an illustration of the EDSAC PC. In the image underneath, is an illustration of the EDSAC test system that can be run on the present PCs. The test system reenacts the EDSAC PC as it existed between 1949-1951.

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