Introduction to Computers - What is Computer
What is a Computer?
Computers in those days
In the olden days, people make use of primitive materials in performing some activities, which of course lead them to less effective result. This was occasioned by the use of less technologically advanced equipment that can perfectly perform those tasks. With time, man began to improve on that equipment; the consequential result is more effective outcome. In the last two centuries, machines were invented that could serve variety of task. Among those machines, computer was the most important as it usage in the modern days has affected the lives of people, to an extend that many have began to imagine the world without computer.
Nothing
epitomizes modern life better than the computer for better or worse,
computer has infiltrated every aspect of our society. Today, computers
do more than simply compute: the importance of computer has cut across
all live aspects. One may wonder where did this master machine come
from, how is it used to achieve aims and where is it leading to? This
article is purposely made to assist people acquire knowledge on how and
when to use computer. This is in line to solve the rising demand for
computer services.
This
article shall be used as a medium to move from computer illiteracy to
literacy. It is also designed to improve on the knowledge of those who
are already computer literate.
DEFINITION AND HISTORY OF COMPUTER
Definition of Computer
Computer
is a very commonly word used often. We are familiar with what a
computer is in specific contemporary sense. Personal computers are found
in most aspect of our daily life, and for some it is hard to even
imagine a world without computer. A computer is a its most basic, a
machine which can take instructions, and perform computations based on
those instructions. It can also be defined as an electronic device that
accept data as raw material, process them and bring out result as
output. Computer can also be defined as an electronic device that accept
data as an input, store and process data, and present information known
as output. It can also be seen as a machine that can be programmed to
manipulate symbols.
Principal characteristics of Computer are;
Principal characteristics of Computer are;
- It responds to specific set of instructions in a well defined manner
- It can quickly store and retrieve large amount of data
- It can execute a prerecorded list of instructions (a programme)
HISTORY OF COMPUTER DEVELOPMENT
Abacus
The abacus device may be considered the first computer. It was invented about 5000 years ago in Asia Minor.
This computer permits the operators to make computations using a system
of sliding beads arranged on a rack. Early merchants used the abacus to
keep trading transactions. With the increased usage of paper and pen,
mostly in Europe,
the use of abacus became insignificant. When the use of abacus came
down the new advanced machine do not quickly replace abacus. A duration
of about 12 centuries made a gap for a new advance machine. Abacus
probably is in use today.
Blaise Pascal: In
1642 an 18 year old son of a French tax collector, Blaise Pascal,
brought to birth a numerical wheel calculator. The primary aim for this
machine was to assists his father perform perfectly some of his
activities. A machine made of brass in a rectangular shape used eight
moveable dials to add sums up to eight figures long. The machine also
called Pascaline used a base of ten to accomplish this. Pascal machine was only used for summation which coarse its weak point.
Gottfried Wilhem Von Leibniz: The Pascal machine was improved on by Gottfried Wilhem Von Leibniz in 1694. this was done by the inclusion of a multiplication machine on the former. Leibniz’s mechanical multiplier worked by a system of gears and dials. The work Leibniz was based on the knowledge derived from Pascal machine. The centerpiece of the machine was its stepped drum gear design which offered an elongated version of the simple flat gear. The work of this German mathematician and philosopher stire until mechanical calculators were appreciated by a lot of people.
Charles Xavier Thomas De Colmar: A Frenchman invented a machine that
could perform the four basic arithmetic functions. Colmar mechanical
calculator, the arithometer, presented a more practical approach to
computing because it could add, subtract, multiply and divide. With its
enhanced versatility, the arithometer was widely used up untl the First
World War. Although later inventors refined Colmar’s calculator.
Together with fellow inventors Pascal and Leibni, he helped define the
age of mechanical computation.
Charles Babbage: An English professor of mathematics after been frustrated at the many errors he found while examining calculations for the Royal Astronomcal Society, says and I quote “I wishh these calculations had been performed by Steam:” He observed a natural harmony between machines and mathematics: machines he says, were best at performing tasks repeated without mistakes. On the other hand, mathematics, particularly the production of mathematical tables, often require the simple repeating of steps. The challenge was on applying the ability of machines to the needs of mathematics.
In 1822 Babbage made an attempt to proffer a solution to this problem
and thus, proposed a machine to perform differential equation called a
Differences Engine. The machine performs calculations and prints the
results automatically.
Babbage was encouraged 10yrs after, working on a different machine to
start work on a analytical engine “the first general purpose computer”.
While in the design of this machine, he was assisted by August at Ada
King, countless of Lovelace (1815 1842) ad daughter of English poet Lord
Bryon. The knowledge of Lady Lovelace’s here permitted her to create
the instruction routines to be fed into the computer, this made her the
first female computer programmer. She was named a programming language ADA in her honour by the U.S Defense Department in the 1980s.
Babbage’s steam-powered engine outlines the basic elements of a modern
general purpose computer and was a break though concept. The basic
design of the analytical engine included input devices in the form of
perforated cards containing instructions and a “store” for memory of
1,000 number of up to 50 decimal digits long. Also contained in the
machine is a “mill” with a control unit that allowed processing
instructions in any sequence and output device to poduce printed
results. Babbage borrowed the idea of punch card to encode the machine
instructions from the Jacquard loom.
Herman Hollerrith: An
American inventor, Herman Hollerith in 1889, applied the Jacquard loom
concept to computing. His first challenge was to find a faster way to
compete the U.S. census.
To do this, Holleriths used cards to store data which he fed into a
machine that compiled the results mechanically. In this method each
punch on a card was used to represent one number and a combination of
two punches represented one letter. With this, instead of a long
duration of about 10yrs a result of census was compiled in a short
duration say six weeks.
Vannevar Bush: Vannevar
Bush invented a calculator that would help for solving differential
equations in 1931. the machine was able to solve complex differential
equations that had long left scientists and mathematicians baffled.
Because of the use of hundreds of gears and shafts required to represent
numbers and their various relationship to other, the machine was highly
compact.
John V. Atanasoff: A professor at Lowa State College now referred to as Lowa State University and
his graduate student, Clifford Berry, envisioned an all-electronic
computer that applied Boolean algebra to computer circuiting. This
approach was based on the mid-19th century work of George Boole who clarified the binary system of algebra which stated that, any mathematical equations could be stated simply as either true or false. By extending this concept to electronic circuits in the form of ‘on or off’, Atanasofff and Berry had
developed the first all-electronic computer by 1940. the project,
however, lost its finding and it was over shadowed by similar
developments by other innovators.
Learn more about computer applications
Learn more about computer applications
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