Introduction of Computer

What is a Computer?

In its most basic form a computer is any device which aids humans in performing various kinds of computations or calculations. In that respect the earliest computer was the abacus, used to perform basic arithmetic operations.

Every computer supports some form of input, processing, and output. This is less obvious on a primitive device such as the abacus where input, output and processing are simply the act of moving the pebbles into new positions, seeing the changed positions, and counting. Regardless, this is what computing is all about, in a nutshell. We input information, the computer processes it according to its basic logic or the program currently running, and outputs the results.

Modern computers do this electronically, which enables them to perform a vastly greater number of calculations or computations in less time. Despite the fact that we currently use computers to process images, sound, text and other non-numerical forms of data, all of it depends on nothing more than basic numerical calculations. Graphics, sound etc. are merely abstractions of the numbers being crunched within the machine; in digital computers these are the ones and zeros, representing electrical on and off states, and endless combinations of those. In other words every image, every sound, and every word have a corresponding binary code.

While abacus may have technically been the first computer most people today associate the word “computer” with electronic computers which were invented in the last century, and have evolved into modern computers we know of today.

This is a searchable directory about the history of computers, computing and a timeline of the history of computers and early calculating machines has been included. Our timeline includes developments in the 1600's and their impact on computing. The development of the modern day computer was the result of advances in technologies and man's need to quantify. (The abacus was one of the first counting machines. Calculating machines were sold commercially before the advent of steel manufacturing technologies. Papyrus was something to write on, before we had paper. Writing was a way to record mathematical calculations.) This history of computers site includes the names of early pioneers of math and computing and links to related sites for further study. A new "Timeline of the History of Computers and Related Technologies" has been added. This site was designed to be used by students assigned topics about the history of computers and computing. Original articles are footnoted and related links are included. One important purpose of this Web page, is to debunk myths some people create, such as "we have computers because of the military" (Not true). We have computers because man wanted to quantify as early as the ancient Chinese Dynasties, when they created the abacus and used it for calculating, and adding and subtracting in particular... Babbage and Lovelace were "programming" machines as early as the 1800's before any military computer in this country. 1801 was the creation of the Jacquard loom which used "punch cards". Cathode Ray Tubes (CRTs) have been around since 1885 and the US gov't first used a computer in the 1950's. Great Britain's COLOSSUS was developed before the ENGIGMA, so people trying to perpetuate the importance of the US military in the development of computer technologies is doing a disservice to students. Electronics and related computer development, and the invention of the transistor were all independent of military intent. If anything, even the totalisator machines were created for statistical purposes and have been used for horse racing, not rocket science. I love my Mac, and it has no military background that I am aware of. Military computers did not have integrated circuits like PC computer chips either... Stop saying computer development was military in origin... simply can't back it up with fact. Yes, the military also had old computers, just like my Commodore was old... but they weren't related... no tubes in my commodore, that was different technology altogether than a military monster computer with vacuum tubes... mechanical relays... ta dah... that was hot stuff in that age.

DATE NOTES and LINKS Era of early Chinese Dynasties Abacus 1450 Gutenberg Press 1617 Napier's Bones 1642 Blaise Pascal, at age 18, Invented hand-powered commercial calculator machine, the Pascaline. 1640's Mechanical Calculators are Manufactured for sale.http://goldenink.com/computersandnetworks.shtml 1670's - attempts to multiply mechanically were made by Gottfried von Liebniz (1646-1716) Principia Mathematicaby Isaac Newton 1687 1750's-1850's through 1900 Industrial Revolution in England, Europe, United States 1801 Jacquard Loom used wooden slat "punch cards" to make patterns on the loom. 1823 Charles Babbage started work on the Difference Engine, through funding from the British Government. While he did produce prototypes of portions of the Difference Engine, it was left to Georg and Edvard Schuetz to construct the first working devices to the same design which were successful in limited applications. 1826 Photography (in France) Niepce. 1831 Charles Babbage founded the British Association for the Advancement of Science. 1833 In this year, Charles Babbage began his work on his Analytical Engine. 1843 Ada Byron Lovelace computer program to calculate Bernoulli numbers, England 1843 Telegraph line established, sent code between Philadelphia and Washington (Morse)(Morse Code) 1864 Maxwell's electromagnetic wave theory. 1877 Phonograph (Edison) 1884 Image Scanner for scanning and transmitting images (Nipkow in Germany) 1885 Cathode Ray Tube 1887 Motion Picture Camera 1888 Gramophone by Berliner 1890 Punch cards on computer used for the US Census (Hollerith) 1898 Telegraphone, a magnetic recording device. (Poulsen) 1905 Electron Tube (Fleming) 1905 Theory of Relativity (Einstein) 1926 First television (J.L.Baird) 1928 80-column punch card (Hollerith) 1929 BBC begins broadcasting 1957 Sputnik I successful satellite launch by Russia on October 4 began the Space Race, the Space Age, and ushered in a panel of scientists for the White House's Panel on Science and Technology called for by U.S. President David D. Eisenhower 1943 Turing COLOSSUS the first programmable computer, England (Great Britain) 1946 ENIAC first electronic computer, in United States of America. 1951 UNIVAC, first computer U.S.A. Government used. 1968 Gordon Moore and Robert Noyce are founders of Intel, to make semiconductors, processors, aka "computer chips". 1977 Apple computers are first sold commercially to home consumers. United States. 1981 IBM computers were sold commercially as "personal computers". 1991 Tim Berns-Lee created the World Wide Web at C.E.R.N. in Switzerland

Introduction to computers

Are you new to computers? Do you wonder what they do and why you would want to use one? Welcome—you're in the right place. This article gives an overview of computers: what they are, the different types, and what you can do with them.

What are computers?

Computers are machines that perform tasks or calculations according to a set of instructions, or programs. The first fully electronic computers, introduced in the 1940s, were huge machines that required teams of people to operate. Compared to those early machines, today's computers are amazing. Not only are they thousands of times faster, they can fit on your desk, in your lap, or even in your pocket.

Computers work through an interaction of hardware and software. Hardwarerefers to the parts of a computer that you can see and touch, including the case and everything inside it. The most important piece of hardware is a tiny rectangular chip inside your computer called the central processing unit (CPU), or microprocessor. It's the "brain" of your computer—the part that translates instructions and performs calculations. Hardware items such as your monitor, keyboard, mouse, printer, and other items are often called hardware devices, or devices.

Software refers to the instructions, or programs, that tell the hardware what to do. A word processing program that you can use to write letters on your computer is a type of software. The operating system (OS) is software that manages your computer and the devices connected to it. Two well-known operating systems are Windows and Macintosh operating system. Your computer uses the Windows operating system.

ENIAC

Introduced in 1946, ENIAC (Electronic Numerical Integrator and Computer) was the first general-purpose electronic computer. It was built for the United States military to calculate the paths of artillery shells. Physically, ENIAC was enormous, weighing more than 27,000 kilograms (60,000 pounds) and filling a large room. To process data, ENIAC used about 18,000 vacuum tubes, each the size of a small light bulb. The tubes burned out easily and had to be constantly replaced.

Types of computers

Computers range in size and capability. At one end of the scale aresupercomputers, very large computers with thousands of linked microprocessors that perform extremely complex calculations. At the other end are tiny computers embedded in cars, TVs, stereo systems, calculators, and appliances. These computers are built to perform a limited number of tasks.

The personal computer, or PC, is designed to be used by one person at a time. This section describes the various kinds of personal computers: desktops, laptops, handheld computers, and Tablet PCs.

Desktop computers

Desktop computers are designed for use at a desk or table. They are typically larger and more powerful than other types of personal computers. Desktop computers are made up of separate components. The main component, called the system unit, is usually a rectangular case that sits on or underneath a desk. Other components, such as the monitor, mouse, and keyboard, connect to the system unit.

Desktop computer

Laptop computers

Laptop computers are lightweight mobile PCs with a thin screen. They are often called notebook computers because of their small size. Laptops can operate on batteries, so you can take them anywhere. Unlike desktops, laptops combine the CPU, screen, and keyboard in a single case. The screen folds down onto the keyboard when not in use.

Laptop computer

Handheld computers

Handheld computers, also called personal digital assistants (PDAs), are battery-powered computers small enough to carry almost anywhere. Although not as powerful as desktops or laptops, handhelds are useful for scheduling appointments, storing addresses and phone numbers, and playing games. Some have more advanced capabilities, such as making telephone calls or accessing the Internet. Instead of keyboards, handhelds have touch screens that you use with your finger or a stylus (a pen-shaped pointing tool).

Handheld computer

Tablet PCs

Tablet PCs are mobile PCs that combine features of laptops and handhelds. Like laptops, they're powerful and have a built-in screen. Like handhelds, they allow you to write notes or draw pictures on the screen, usually with a tablet pen instead of a stylus. They can also convert your handwriting into typed text. Some Tablet PCs are “convertibles” with a screen that swivels and unfolds to reveal a keyboard underneath.

Tablet PC

What can you do with computers?

In the workplace, many people use computers to keep records, analyze data, do research, and manage projects. At home, you can use computers to find information, store pictures and music, track finances, play games, and communicate with others—and those are just a few of the possibilities.

You can also use your computer to connect to the Internet, a network that links computers around the world. Internet access is available for a monthly fee in most urban areas, and increasingly, in less populated areas. With Internet access, you can communicate with people all over the world and find a vast amount of information.

Here are some of the most popular things to do with computers:

The web

The World Wide Web (usually called the Web, or web) is a gigantic storehouse of information. The web is the most popular part of the Internet, partly because it displays most information in a visually appealing format. Headlines, text, and pictures can be combined on a single webpage—much like a page in a magazine—along with sounds and animation. A website is a collection of interconnected webpages. The web contains millions of websites and billions of webpages.

Example of a webpage (Microsoft Game Studios)

Surfing the web means exploring it. You can find information on the web about almost any topic imaginable. For example, you can read news stories and movie reviews, check airline schedules, see street maps, get the weather forecast for your city, or research a health condition. Most companies, government agencies, museums, and libraries have websites with information about their products, services, or collections. Reference sources, such as dictionaries and encyclopedias, are also widely available.

The web is also a shopper's delight. You can browse and purchase products—books, music, toys, clothing, electronics, and much more—at the websites of major retailers. You can also buy and sell used items through websites that use auction-style bidding.

For information about how to explore the Internet and the web, see Exploring the Internet.

E‑mail

E‑mail (short for electronic mail) is a convenient way to communicate with others. When you send an e‑mail message, it arrives almost instantly in the recipient's e‑mail inbox. You can send e‑mail to many people simultaneously, and you can save, print, and forward e‑mail to others. You can send almost any type of file in an e‑mail message, including documents, pictures, and music files. And with e‑mail, you don't need a stamp! See Getting started with e‑mail.

Instant messaging

Instant messaging is like having a real-time conversation with another person or a group of people. When you type and send an instant message, the message is immediately visible to all participants. Unlike e‑mail, all participants have to be online (connected to the Internet) and in front of their computers at the same time. Communicating by means of instant messaging is calledchatting.

Pictures, music, and movies

If you have a digital camera, you can move your pictures from the camera to your computer. Then you can print them, create slide shows, or share them with others by e‑mail or by posting them on a website. (To learn more about what you can do with photos, see Working with digital pictures.) You can also listen to music on your computer, either by importing (transferring to your computer) music from audio CDs or by purchasing songs from a music website. Or, tune in to one of the thousands of radio stations that broadcast over the Internet. If your computer comes with a DVD player, you can watch movies.

Gaming

Do you like to play games? Thousands of computer games in every conceivable category are available to entertain you. Get behind the wheel of a race car, battle frightening creatures in a dungeon, or control civilizations and empires! Many games allow you to compete with other players around the world through the Internet. Windows includes a variety of card games, puzzle games, and strategy games