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The Computer Essay In English

The Age of Computers

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The Age of Computers

Believe it or not, but the age of computers is upon us. I believe Computers are not only here to stay, but in my opinion computers are the wave of the future. Only a device like the computer can change the way we work, live, and think. I see computers taking us places where no man has gone before. Twenty years ago people were just not up to date with computers back then. I mean if you ask someone about a computer, they probably would say something like, what in the world our you talking about, or what the hell is a computer. Today just about anybody you ask, can tell you something about a computer. Papia Bhattacharyya , says: "Technology has bounded onto the center stage in the last few years"(59). The earliest existence of the modern day computer's ancestor is the abacus. The abacus dates back to almost 2000 years ago. It is simply a wooden rack holding beads which are strung on wires. The next step in computers took place in 1694 when Blaise Pascal invented the first digital calculating machine, which was designed to help Pascal's father who was a tax collector.

Now we look at Charles Babbage, who many say is the father of computers. Charles Babbage was a professor of mathematics. In the 1800's Babbage designed an automatic calculation machine. This machine was steam powered and could store up to 1000 50-digit numbers. Charles Babbage was so ahead of his time, that the machines that were used back then were not even precise enough to make the parts for his computer. Gulliver, states:

The first major use for a computer in the US was during the 1890 census. Two men, Herman Hollerith and James Powers, developed a new punched-card system that could automatically read information on cards without human intervention (Gulliver 82).

In the 1930's punched-card machine techniques had become so well established that Howard Hathaway Aiken, together with engineers at IBM, came up with the automatic computer called Mark I. The Mark I ran by using prepunched paper tape. The Mark I was slow, and required 3 to 5 seconds to perform multiplication.

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Computers         Charles Babbage         Center Stage         Blaise Pascal         Modern Day         Next Step         Collector        

But the computer was fully automatic and could complete long math problems without any human intervention.

John P. Eckert, and John W. Mauchley in 1942 decided to build a high-speed electronic computer to do the job. This machine became known as ENIAC, for "Electrical Numerical Integrator And Calculator". Dolotta explains:

ENIAC used 18,000 standard vacuum tabes, occupied 1800 square feet of floor space, and used about 180,000 watts of electricity. ENIAC is generally accepted as the first successful high-speed electronic digital computer and was used in many applications from 1946 to 1955 (Dolotta 50).

A new look at the wonderful advancements in the world of computers, at this stage in time many things were beginning to happen with the computer. Shallis says:

In 1971 Marcian E. Hoff Jr, an engineer at the Intel Corporation, invented the microprocessor and another stage in the development of the computer began (Shallis 121).
In the 1980's large scale integration, in which hundreds of thousands of transistors are placed on a single chip, become common.

Computers are taking us places where a lot of us thought was not possible. For instance the so called virtual reality is now being tested. This is a way to make reality come to life on a computer monitor. One wears these special electronic glasses and an electronic suit, and fastened to the suit are sensors, which send information to the main computer. The computer works with the data, and gives a three-dimensional view, as one looks through the electronic spectacles. If you wanted to be soldier, all you had to do was simply change the scenery on the main computer, and you would be in the battle field fighting. Today many kids have computer games that will just blow you away, computer games so realistic, they can damn near scare you to death.

From Charles Babbage, who to many is consider the father of computers till now, computers have grown from a standing start, into one of the biggest industries in the United States. Papia Bhattacharyya states, "Everyone wants to, and may perhaps eventually have to be a knower to survive"(59). I see computers in the future taking us places where no man has gone before. Truly it is my belief and opinion, the computer is one of the most incredible inventions of this time period or any other.

Work Cited

Bhattacharyya, Papia. "BAD ASSOCIATIONS". Reading and Writing Short Arguments.ED

William Vesterman. Mountain View, California: Mayfield Press, 1997. 58-61.

Dolotta, T.A. "Data Processing: 1940-1985" New York: John Wiley & Sons, 1985.

Gulliver, David. "Silicon Valley and Beyond" Berkeley, Ca: Berkeley Area Government Press, 1981.

Shallis, Michael. "The Silicon Idol". New York: Shocken Books, 1984.

This article has many issues. Please help fix them or discuss these issues on the talk page.

A computer is a machine (mostly electronic) that is able to take information (input), and process it to make new information (output).

Calculating machines are old in the history of technology. Early examples are the astrolabe and the abacus. Today a computer is a programmable machine. The two principal characteristics of a computer are: It responds to a specific instruction set in a well-defined manner and it can execute a prerecorded list of instructions (a program). There are four main processing steps in a computer: inputting, storage, outputting and processing.

Modern computers are very different from early computers. They can do billions of calculations per second. Most people have used a personal computer in their home or at work. Computers do many different jobs where automation is useful. Some examples are controlling traffic lights, vehicle computers, security systems, washing machines and digital televisions.

A computer user can control it by a user interface. Input devices include keyboard, mouse, buttons, and touch screens. Some very sophisticated computers can also be controlled with voice commands or hand gestures or even brain signals through electrodes implanted in the brain or along nerves.

Computers can be designed to do almost anything with information. Computers are used to control large and small machines which in the past were controlled by humans. They are also in homes, where they are used for things such as listening to music, reading the news and writing.

Modern computers are electronic computer hardware. They do mathematical arithmetic very quickly but computers do not really "think". They only follow the instructions in their software programs. The software uses the hardware when the user gives it instructions, and gives useful output.

Computer programs are designed or written by computer programmers. A few programmers write programs in the computer's own language called machine code. Most programs are written using a programming language like C++, Java, and Fortran. These programming languages are more like the language with which one talks and writes every day. The compiler translates the user's instructions into binary code (machine code) that the computer will understand and do what is needed.

History of computers[change | change source]

Definition[change | change source]

A computer is a programmable electronic device designed to accept data, perform prescribed mathematical and logical operations at high speed, and display the results of these operations, all under the control of software. Mainframes, desktop and laptop computers, tablets and smartphones are some of the different types of computers. An electronic machine which helps in solving problems quickly and easily. It solves problems according to instructions given to it by the computer user called programs or software. It is a digital machine(that uses binary digits) used in all fields.

Automation[change | change source]

Most humans have a problem with math. To show this, try doing 584 × 3,220 in your head. It is hard to remember all the steps! People made tools to help them remember where they were in a maths problem. The other problem people have is that they have to do the same problem over and over and over again. A cashier had to make change every day in her head or with a piece of paper. That took a lot of time and made mistakes. So, people made calculators that did those same things over and over. This part of computer history is called the "history of automated calculation," which is a fancy phrase for "the history of machines that make it easy for me to do this same maths problem over and over without making mistakes."

The abacus, the slide rule, the astrolabe and the Antikythera mechanism (which dates from about 150-100 BC) are examples of automated calculation machines.

Programming[change | change source]

Main article: Computer programming

People did not want a machine that would do the same thing over and over again. For example, a music box is a machine that plays the same music over and over again. Some people wanted to be able to tell their machine to do different things. For example, they wanted to tell the music box to play different music every time. They wanted to be able to program the music box- to order the music box to play different music. This part of computer history is called the "history of programmable machines" which is a fancy phrase for "The history of machines that I can order to do different things if I know how to speak their language."

One of the first examples of this was built by Hero of Alexandria (c. 10–70 AD). He built a mechanical theater which performed a play lasting 10 minutes and was operated by a complex system of ropes and drums. These ropes and drums were the language of the machine- they told what the machine did and when. Some people argue that this is the first programmable machine.[1]

Historians disagree on which early machines are "computers". Many say the "castle clock", an astronomical clock invented by Al-Jazari in 1206, is the first known programmableanalog computer. Others say the first computer was made by Charles Babbage.[2]Al - Jazari's showed the zodiac, the solar and lunar orbits, a crescent moon-shaped pointer travelling across a gateway that made some doors to open every hour,[3][4] and five robotic musicians who play music when levers hit them. The length of day and night could be changed (AKA re-programmed) every day in order to account for the changing lengths of day and night throughout the year.[2]Ada Lovelace is considered to be the first programmer.[5][6][7]

The Computing Era[change | change source]

At the end of the Middle Ages, people in Europe thought math and engineering were more important. In 1623, Wilhelm Schickard made a mechanical calculator. Other Europeans made more calculators after him. They were not modern computers because they could only add, subtract, and multiply- you could not change what they did to make them do something like play Tetris. Because of this, we say they were not programmable. Now engineers use computers to design and plan.

In 1801, Joseph Marie Jacquard used punched paper cards to tell his textile loom what kind of pattern to weave. He could use punch cards to tell the loom what to do, and he could change the punch cards, which means he could program the loom to weave the pattern he wanted. This means the loom was programmable.

Charles Babbage wanted to make a similar machine that could calculate. He called it "The Analytical Engine".[8] Because Babbage did not have enough money and always changed his design when he had a better idea, he never built his Analytical Engine.

As time went on, computers were used more. People get bored easily doing the same thing over and over. Imagine spending your life writing things down on index cards, storing them, and then having to go find them again. The U.S. Census Bureau in 1890 had hundreds of people doing just that. It was expensive, and reports took a long time. Then an engineer worked out how to make machines do a lot of the work. Herman Hollerith invented a tabulating machine that would automatically add up information that the Census bureau collected. The Computing Tabulating Recording Corporation (which later became IBM) made his machines. They leased the machines instead of selling them. Makers of machines had long helped their users understand and repair them, and CTR's tech support was especially good.

Because of machines like this, new ways of talking to these machines were invented, and new types of machines were invented, and eventually the computer as we know it was born.

Analog and Digital Computers[change | change source]

In the first half of the 20th century, scientists started using computers, mostly because scientists had a lot of math to figure out and wanted to spend more of their time thinking about science questions instead of spending hours adding numbers together. For example, if they had to launch a rocket ship, they needed to do a lot of math to make sure the rocket worked right. So they put together computers. These analog computers used analog circuits, which made them very hard to program. In the 1930s, they invented digital computers, and soon made them easier to program.

High-scale computers[change | change source]

Scientists figured out how to make and use digital computers in the 1930s and 1940s. Scientists made a lot of digital computers, and as they did, they figured out how to ask them the right sorts of questions to get the most out of them. Here are a few of the computers they built:

  • Konrad Zuse's electromechanical "Z machines". The Z3 (1941) was the first working machine that used binary arithmetic. Binary arithmetic means using "Yes" and "No." to add numbers together. You could also program it. In 1998 the Z3 was proved to be Turing complete. Turing complete means that it is possible to tell this particular computer anything that it is mathematically possible to tell a computer. It is the world's first modern computer.
  • The non-programmable Atanasoff–Berry Computer (1941) which used vacuum tubes to store "yes" and "no" answers, and regenerative capacitor memory.
  • The Harvard Mark I (1944), A big computer that you could kind of program.
  • The U.S. Army's Ballistics Research Laboratory ENIAC (1946), which could add numbers the way people do (using the numbers 0 through 9) and is sometimes called the first general purpose electronic computer (since Konrad Zuse's Z3 of 1941 used electromagnets instead of electronics). At first, however, the only way to reprogram ENIAC was by rewiring it.

Several developers of ENIAC saw its problems. They invented a way to for a computer to remember what they had told it, and a way to change what it remembered. This is known as "stored program architecture" or von Neumann architecture. John von Neumann talked about this design in the paper First Draft of a Report on the EDVAC, distributed in 1945. A number of projects to develop computers based on the stored-program architecture started around this time. The first of these was completed in Great Britain. The first to be demonstrated working was the Manchester Small-Scale Experimental Machine (SSEM or "Baby"), while the EDSAC, completed a year after SSEM, was the first really useful computer that used the stored program design. Shortly afterwards, the machine originally described by von Neumann's paper—EDVAC—was completed but was not ready for two years.

Nearly all modern computers use the stored-program architecture. It has become the main concept which defines a modern computer. The technologies used to build computers have changed since the 1940s, but many current computers still use the von-Neumann architecture.

In the 1950s computers were built out of mostly vacuum tubes. Transistors replaced vacuum tubes in the 1960s because they were smaller and cheaper. They also need less power and do not break down as much as vacuum tubes. In the 1970s, technologies were based on integrated circuits. Microprocessors, such as the Intel 4004 made computers smaller, cheaper, faster and more reliable. By the 1980s, microcontrollers became small and cheap enough to replace mechanical controls in things like washing machines. The 1980s also saw home computers and personal computers. With the evolution of the Internet, personal computers are becoming as common as the television and the telephone in the household.

In 2005 Nokia started to call some of its mobile phones (the N-series) "multimedia computers" and after the launch of the Apple iPhone in 2007, many are now starting to add the smartphone category among "real" computers. In 2008, if smartphones are included in the numbers of computers in the world, the biggest computer maker by units sold, was no longer Hewlett-Packard, but rather Nokia.[source?]

Kinds of computers[change | change source]

There are many types of computers:

  1. personal computer
  2. Workstation computer
  3. mainframe computer
  4. minicomputer
  5. supercomputer
  6. embedded system
  7. Tablet computer

A "desktop computer" is a small machine that has a screen (which is not part of the computer). Most people keep them on top of a desk, which is why they are called "desktop computers." "Laptop computers" are computers small enough to fit on your lap. This makes them easy to carry around. Both laptops and desktops are called personal computers, because one person at a time uses them for things like playing music, surfing the web, or playing video games.

There are bigger computers that many people at a time can use. These are called "Mainframes," and these computers do all the things that make things like the internet work. You can think of a personal computer like this: the personal computer is like your skin: you can see it, other people can see it, and through your skin you feel wind, water, air, and the rest of the world. A mainframe is more like your internal organs: you never see them, and you barely even think about them, but if they suddenly went missing, you would have some very big problems.

An embedded computer, also called embedded system is a computer that does one thing and one thing only, and usually does it very well. For example, an alarm clock is an embedded computer: it tells the time. Unlike your personal computer, you cannot use your clock to play Tetris. Because of this, we say that embedded computers cannot be programmed, because you cannot install more programs on your clock. Some mobile phones, automatic teller machines, microwave ovens, CD players and cars are operated by embedded computers.

All-in-one PC[change | change source]

All-in-one computers are desktop computers that have all of the computer's inner mechanisms in the same case as the monitor. Apple has made several popular examples of all-in-one computers, such as the original Macintosh of the mid-1980s and the iMac of the late 1990s and 2000s.

Common uses of home computers[change | change source]

Common uses of work computers[change | change source]

  • Word processing
  • Spreadsheets (Excel)
  • PowerPoint Presentations
  • Photo Editing (Photoshop, GIMP)
  • E-mail
  • Video editing/rendering/encoding
  • Audio recording
  • System Management

Working methods[change | change source]

Computers store data and the instructions as numbers, because computers can do things with numbers very quickly. These data are stored as binarysymbols (1s and 0s). A 1 or a 0 symbol stored by a computer is called a bit, which comes from the words binary digit. Computers can use many bits together to represent instructions and the data that these instructions use. A list of instructions is called a program and is stored on the computer's hard disk. Computers work through the program by using a central processing unit, and they use fast memory called RAM as a space to store the instructions and data while they are doing this. When the computer wants to store the results of the program for later, it uses the hard disk because things stored on a hard disk can still be remembered after the computer is turned off.

An operating system tells the computer how to understand what jobs it has to do, how to do these jobs, and how to tell people the results. Millions of computers may be using the same operating system, while each computer can have its own application programs to do what its user needs. Using the same operating systems makes it easy to learn how to use computers for new things. A user who needs to use a computer for something different, can learn how to use a new application program. Some operating systems can have simple command lines or a fully user-frendly GUI.

The Internet[change | change source]

One of the most important jobs that computers do for people is helping with communication. Communication is how people share information. Computers have helped people move forward in science, medicine, business, and learning, because they let experts from anywhere in the world work with each other and share information. They also let other people communicate with each other, do their jobs almost anywhere, learn about almost anything, or share their opinions with each other. The Internet is the thing that lets people communicate between their computers.

Computers and waste[change | change source]

A computer is now almost always an electronic device. It usually contains materials that will become electronic waste when discarded. When a new computer is bought in some places, laws require that the cost of its waste management must also be paid for. This is called product stewardship.

Computers can become obsolete quickly, depending on what programs the user runs. Very often, they are thrown away within two or three years, because some newer programs require a more powerful computer. This makes the problem worse, so computer recycling happens a lot. Many projects try to send working computers to developing nations so they can be re-used and will not become waste as quickly, as most people do not need to run new programs. Some computer parts, such as hard drives, can break easily. When these parts end up in the landfill, they can put poisonous chemicals like lead into the ground water. Hard drives can also contain secret information like credit card numbers. If the hard drive is not erased before being thrown away, an identity thief can get the information from the hard drive, even if the drive doesn't work, and use it to steal money from the previous owner's bank account.

Main hardware[change | change source]

Computers come in different forms, but most of them have a common design.

  • All computers have a CPU.
  • All computers have some kind of data bus which lets them get inputs or output things to the environment.
  • All computers have some form of memory. These are usually chips (integrated circuits) which can hold information.
  • Many computers have some kind of sensors, which lets them get input from their environment.
  • Many computers have some kind of display device, which lets them show output. They may also have other peripheral devices connected.

A computer has several main parts. When comparing a computer to a human body, the CPU is like a brain. It does most of the 'thinking' and tells the rest of the computer how to work. The CPU is on the Motherboard, which is like the skeleton. It provides the basis for where the other parts go, and carries the nerves that connect them to each other and the CPU. The motherboard is connected to a power supply, which provides electricity to the entire computer. The various drives (CD drive, floppy drive, and on many newer computers, USB flash drive) act like eyes, ears, and fingers, and allow the computer to read different types of storage, in the same way that a human can read different types of books. The hard drive is like a human's memory, and keeps track of all the data stored on the computer. Most computers have a sound card or another method of making sound, which is like vocal cords, or a voice box. Connected to the sound card are speakers, which are like a mouth, and are where the sound comes out. Computers might also have a graphics card, which helps the computer to create visual effects, such as 3D environments, or more realistic colors, and more powerful graphics cards can make more realistic or more advanced images, in the same way a well trained artist can.

Largest Computer Companies[change | change source]

Company nameSales
(US$ billion)
HP (Hewlett-Packard)112,300

References[change | change source]

  1. "Heron of Alexandria". Retrieved 2008-01-15. 
  2. 2.02.1Ancient Discoveries, Episode 11: Ancient Robots, History Channel, retrieved 2008-09-06 
  3. ↑Howard R. Turner (1997), Science in Medieval Islam: An Illustrated Introduction, p. 184, University of Texas Press, ISBN 0-292-78149-0
  4. ↑Donald Routledge Hill, "Mechanical Engineering in the Medieval Near East", Scientific American, May 1991, pp. 64-9 (compare Donald Routledge Hill, Mechanical Engineering)
  5. ↑Fuegi & Francis 2003, pp. 16–26.
  6. ↑Phillips, Ana Lena (November–December 2011). "Crowdsourcing gender equity: Ada lovelace day, and its companion website, aims to raise the profile of women in science and technology". American Scientist99 (6): 463. 
  7. "Ada Lovelace honoured by Google doodle", The Guardian, 2012 Dec 10, retrieved 10 December 2012 .
  8. ↑Don't confuse the Analytical Engine with Babbage's difference engine which was a non-programmable mechanical calculator.

Other websites[change | change source]

A drawing of a usual modern desktop computer.
EDSAC was one of the first computers that remembered what you told it even after you turned the power off. This is called (von Neumann) architecture.