The Past And Present Of Computers

The Past And Present Of Computers
Computer (computador) is​ an​ appliance which can manipulate data in​ accordance with a​ list of​ instructions .​
It is​ a​ type of​ data processing system.
Today the​ computer (computador) has become indispensable in​ every household and comes in​ numerous physical forms .​
The first modern day computer was developed in​ the​ mid-20th century,​ though the​ concept of​ computer (computador) and various similar machines existed before .​
It actually started in​ 1837,​ when `The Analytical Engine`,​ the​ first fully programmable mechanical computer,​ was designed by Charles Babbage.
The Earlier versions were huge and bulky and used up a​ whole room .​
The device EDSAC (Electronic Delay Storage Automatic Calculator) was one of​ the​ very first computers that could implement the​ stored program architecture .​
In comparison to​ them,​ modern computers (computador) have tiny integrated circuits and are much better in​ terms of​ capacity and speed as​ well as​ accuracy .​
Today`s tinier version can even fit in​ your wrist watch and are powered from the​ watch battery .​
Personal computers can be found in​ almost every house today and in​ various forms .​
They are in​ fact the​ icons of​ the​ information age.
What makes computers (computador) highly versatile and distinguishable from other appliances is​ that it​ can be programmed .​
a​ calculator can only calculate,​ just like a​ washing machine can only wash,​ but a​ computer can be programmed to​ do any kind of​ job .​
Software programs are a​ list of​ instructions that can be stored and executed by the​ computer.
A general computer (computador) has four major sections,​ the​ arithmetic and logical unit or​ ALU,​ the​ control unit or​ CU,​ memory and the​ interface for input and output devices .​
These parts of​ computer are interconnected by busses .​
The ALU,​ control unit,​ registers,​ and the​ interface for input and output devices are collectively known as​ the​ central processing unit or​ CPU .​
The Early CPUs used to​ be composed of​ different separate components,​ however since the​ 1975; the​ CPUs are being constructed on​ a​ single integrated circuit,​ the​ microprocessor.
The ALU is​ for arithmetic and logical operations of​ the​ computer while the​ control unit is​ for directing the​ various parts of​ a​ computer (computador) .​
Its job involves reading and interpreting the​ instructions of​ the​ programs one by one and converting them into control signals for operating other parts of​ the​ computer.
The earlier version of​ computer (computador) used Magnetic core memory but today it​ has been replaced by the​ semiconductor memory .​
The main memory of​ Computer is​ divided in​ two parts,​ RAM or​ random access memory and ROM or​ read-only memory .​
RAM can be written and read anytime through CPU commands .​
On the​ other hand,​ ROM is​ pre-loaded with software and data that never changes,​ and it​ can be only read by the​ CPU.
I/O is​ hardware by the​ means of​ which a​ computer(computador) can receive information from the​ outside world and also sends back results .​
Common input devices are the​ keyboard and mouse .​
While common output devices include monitor and printer .​
There are some devices that serve as​ both input and output devices like Hard disk drives,​ optical disc drives,​ floppy disk drives etc.
Internet has literary changed our lives .​
Today people can search all types of​ information on​ various subjects,​ advertise their company or​ products pass information to​ a​ large group of​ people and do much more merely by a​ few clicks of​ the​ mouse .​
Whether you want to​ search a​ new home or​ compare prices of​ the​ latest mobile or​ fill up your college form or​ read the​ latest Harry Potter book,​ everything can be done on​ the​ Internet through your computer.
With increase of​ computers (computador) and its uses,​ an​ increasing number of​ professions involving computers have also developed .​
Computer-related professions include Electrical engineering,​ Nanoscale engineering Telecommunications engineering,​ Software engineering,​ Web design,​ Desktop publishing and Optical engineering.

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