Materi Perkuliahan Bahasa Inggris
Laula Innasari, S.S., M.Hum
Getting to know the computer
What is a computer?
A computer is an electronic device that manipulates information, or “data.” It has the ability to store, retrieve, and process data. You can use a computer to type documents, send email, and browse the internet. You can also use it to handle spreadsheets, accounting, database management, presentations, games, and more.
The computer is no longer a novelty today. It is something that is highly functional and useful not only to scientists, managers, businessmen, professionals, and government officials, but also to students like you.
The world is changing because of the computer. The computer can do almost any routine or systematic procedure or operation involving information, so that people can have more time to do what they do best – think.
The term computer has many definitions. The easiest to understand and remember is: A computer is an electronic device designed to manipulate data so that useful information can be generated. Data may be defined as any collection of facts. By this definition, data may refer to both numerical and non-numerical information. Data processing is the manipulation of data into a more useful form. It involves the collection, processing, and distribution of facts and figures to achieve a desired result. It may also involve the classification of data and the transmission of data from one place to another. All the operations involved in data processing may have been performed by some kind of a machine or a computer, although some of them could have been carried out manually. Data processing system refers to the equipment or devices as well as procedures by which the result is achieved. In short, a computer is part of a data processing system.
A computer accepts information (in the form of digitalized data) and manipulates it for some result based on a program or sequence of instructions on how the data is to be processed. Complex computers also include the means for storing data (including the program, which is also a form of data) for some necessary duration. A program may be invariable and built into the computer (and called logic circuitry as it is on microprocessors) or different programs may be provided to the computer (loaded into its storage and then started by an administrator or user). Today’s computers have both kinds of programming.
What are the Different Types of Computers?
When most people hear the word “computer” they think of a personal computer such as a desktop or laptop computer. However, computers come in many shapes and sizes, and they perform many different functions in our daily lives. When you withdraw cash from an ATM, scan groceries at the store, or use a calculator, you’re using a type of computer.
Many people use desktop computers at work, home, school, or the library. They can be small, medium, or large in style, and usually sit on a desk. Once you add a monitor, mouse, and a keyboard, you have what is typically known as a desktop computer.
Most desktop computers are easy to upgrade and expand, or add new parts. Another benefit of desktop computers is the cost. If you compare a desktop and a laptop with the same features, you will most likely find that the desktop computer is priced lower.
Some desktop computers have a built-in monitor to save space. These are often called all-in-one desktop computers.
The second type of computer that you may be familiar with is a laptop computer, or laptops as they are often referred to. Laptops are battery or AC-powered personal computers that are more portable than desktop computers, allowing you to use them almost anywhere.
Since a laptop is smaller than a desktop, it’s more difficult to access the internal components. That means you may not be able to upgrade them as much as a desktop. However, it’s usually possible to add more RAM or a bigger hard drive. A laptop computer is sometimes called a notebook computer because of its size.
A server is a computer that “serves up” information to other computers on a network. Many businesses have file servers that employees can use to store and share files. A server can look like a regular desktop computer, or it can be much larger.
Servers also play an important role in making the internet work: they are where web pages are stored. When you use your browser to click a link, a web server delivers the page you requested.
Other Types of Computers
Today, there lots of everyday devices that are basically specialized computers, even though we don’t always think of them as computers. Here are a few common examples:
- Tablet Computers: These use a touch-sensitive screen for typing and navigation. Since they don’t require a keyboard or mouse, tablet computers are even more portable than laptops. The iPad is an example of a tablet computer.
- Mobile Phones: Many mobile phones can do a lot of things a computer can do, such as browsing the internet or playing games. These phones are often called smart phones.
- Game Consoles: A game console is a specialized kind of computer that is used for playing video games. Although they are not as fully-featured as a desktop computer, many newer consoles, such as the Nintendo Wii, allow you to do non-gaming tasks like browsing the internet.
- TVs: Many TVs now include applications (or apps) that let you access various types of online content. For example, you can view your Facebook news feed or watch streaming movies on Netflix. ( Source: ©1998-2012 Goodwill Community Foundation, Inc.)
- Answer the questions below.
- What is a computer?
- What is the ability of a computer?
- What are the uses of a computer?
- How does a computer work?
- What are different types of computers?
- Find the description of these words
- 1. Manipulate : to carry out, to perform
- Digitalized : to make something in digital form
- Built-in : to be set/installed
- Access : to get into
- Upgrade : to improve with higher quality
- Serve-up : to work for
- Look at the phrase “digitalized data”. It means “data which has digital form”. Digitalized is an adjective which modifies the noun data.
Explain the meaning of these phrases.
- Personal computer : computer which is used personally / for personal need
- Built-in monitor: monitor that is already installed
- Notebook computer: computer which has size and use like a notebook
- File server: computer that serves files to other computers
- Web page: page of a web
- Specialized computer: computer with special function
- Touch-sensitive screen: screen that is sensitive by touch
- Fully-featured computer: computer with full/complete feature
- Non-gaming tasks: any tasks except games
- News feed: feed of news
Simple sentence is a sentence which consists of one Subject and one Verb.
Complete the sentences below with the Object or Complement.
- I often read ….a magazine in the evening.
- Sally always plays …………………………………………………………………
- Many Japanese men like playing …………………………………………
- My daughter listens to ………………………………………………………..
- Most people have ………………………………………………………………
- My friend Jimmy writes ………………………………….. …………………
- My friends and I visit …………………………………………………………..
- The child hates going to ……………………………………………………….
Change the sentences into interrogative.
- Do you often read a magazine in the evening?
- Does she always play …………………………………………………………………………….. ?
- Do they like playing …………………………………………………………………………………?
- Does she …………………………………………………………………………………………………. ?
- Do they ……………………………………………………………………………………………………?
- Does he …………………………………………………………………………………………………..?
- Do we ………………………………………………………………………………………………………?
- Does the child ………………………………………………………………………………………….?
The history of computers
The first computer
The first substantial computer was the giant ENIAC machine by John W. Mauchly and J. Presper Eckert at the University of Pennsylvania. ENIAC (Electrical Numerical Integrator and Calculator) used a word of 10 decimal digits instead of binary ones like previous automated calculators/computers. ENIAC was also the first machine to use more than 2,000 vacuum tubes, using nearly 18,000 vacuum tubes. Storage of all those vacuum tubes and the machinery required to keep the cool took up over 167 square meters (1800 square feet) of floor space. Nonetheless, it had punched-card input and output and arithmetically had 1 multiplier, 1 divider-square rooter, and 20 adders employing decimal “ring counters,” which served as adders and also as quick-access (0.0002 seconds) read-write register storage.
The executable instructions composing a program were embodied in the separate units of ENIAC, which were plugged together to form a route through the machine for the flow of computations. These connections had to be redone for each different problem, together with presetting function tables and switches. This “wire-your-own” instruction technique was inconvenient, and only with some license could ENIAC be considered programmable; it was, however, efficient in handling the particular programs for which it had been designed. ENIAC is generally acknowledged to be the first successful high-speed electronic digital computer (EDC) and was productively used from 1946 to 1955. A controversy developed in 1971, however, over the patentability of ENIAC’s basic digital concepts, the claim being made that another U.S. physicist, John V. Atanasoff, had already used the same ideas in a simpler vacuum-tube device he built in the 1930s while at Iowa State College. In 1973, the court found in favor of the company using Atanasoff claim and Atanasoff received the acclaim he rightly deserved.
Progression of Hardware
In the 1950’s two devices would be invented that would improve the computer field and set in motion the beginning of the computer revolution. The first of these two devices was the transistor. Invented in 1947 by William Shockley, John Bardeen, and Walter Brattain of Bell Labs, the transistor was fated to oust the days of vacuum tubes in computers, radios, and other electronics.
The vacuum tube, used up to this time in almost all the computers and calculating machines, had been invented by American physicist Lee De Forest in 1906. The vacuum tube, which is about the size of a human thumb, worked by using large amounts of electricity to heat a filament inside the tube until it was cherry red. One result of heating this filament up was the release of electrons into the tube, which could be controlled by other elements within the tube. De Forest’s original device was a triode, which could control the flow of electrons to a positively charged plate inside the tube. A zero could then be represented by the absence of an electron current to the plate; the presence of a small but detectable current to the plate represented a one.
Vacuum tubes were highly inefficient, required a great deal of space, and needed to be replaced often. Computers of the 1940s and 50s had 18,000 tubes in them and housing all these tubes and cooling the rooms from the heat produced by 18,000 tubes was not cheap. The transistor promised to solve all of these problems and it did so. Transistors, however, had their problems too. The main problem was that transistors, like other electronic components, needed to be soldered together. As a result, the more complex the circuits became, the more complicated and numerous the connections between the individual transistors and the likelihood of faulty wiring increased.
In 1958, this problem too was solved by Jack St. Clair Kilby of Texas Instruments. He manufactured the first integrated circuit or chip. A chip is really a collection of tiny transistors which are connected together when the transistor is manufactured. Thus, the need for soldering together large numbers of transistors was practically nullified; now only connections were needed to other electronic components. In addition to saving space, the speed of the machine was now increased since there was a diminished distance that the electrons had to follow.
Mainframes to PCs
The 1960s saw large mainframe computers become much more common in large industries and with the US military and space program. IBM became the unquestioned market leader in selling these large, expensive, error-prone, and very hard to use machines.
A veritable explosion of personal computers occurred in the early 1970s, starting with Steve Jobs and Steve Wozniak exhibiting the first Apple II at the First West Coast Computer Faire in San Francisco. The Apple II boasted built-in BASIC programming language, color graphics, and a 4100 character memory for only $1298. Programs and data could be stored on an everyday audio-cassette recorder. Before the end of the fair, Wozniak and Jobs had secured 300 orders for the Apple II and from there Apple just took off.
Also introduced in 1977 was the TRS-80. This was a home computer manufactured by Tandy Radio Shack. In its second incarnation, the TRS-80 Model II, came complete with a 64,000 character memory and a disk drive to store programs and data on. At this time, only Apple and TRS had machines with disk drives. With the introduction of the disk drive, personal computer applications took off as a floppy disk was a most convenient publishing medium for distribution of software.
IBM, which up to this time had been producing mainframes and minicomputers for medium to large-sized businesses, decided that it had to get into the act and started working on the Acorn, which would later be called the IBM PC. The PC was the first computer designed for the home market which would feature modular design so that pieces could easily be added to the architecture. Most of the components, surprisingly, came from outside of IBM, since building it with IBM parts would have cost too much for the home computer market. When it was introduced, the PC came with a 16,000 character memory, keyboard from an IBM electric typewriter, and a connection for tape cassette player for $1265.
By 1984, Apple and IBM had come out with new models. Apple released the first generation Macintosh, which was the first computer to come with a graphical user interface(GUI) and a mouse. The GUI made the machine much more attractive to home computer users because it was easy to use. Sales of the Macintosh soared like nothing ever seen before. IBM was hot on Apple’s tail and released the 286-AT, which with applications like Lotus 1-2-3, a spreadsheet, and Microsoft Word, quickly became the favorite of business concerns.
That brings us up to about ten years ago. Now people have their own personal graphics workstations and powerful home computers. The average computer a person might have in their home is more powerful by several orders of magnitude than a machine like ENIAC. The computer revolution has been the fastest growing technology in man’s history.
(Source: http: //www.computerhistory.org/timeline/index.page)
Characteristics of a computer
A computer is a device with remarkable efficiency and speed. In fact, it is described as an intelligent machine. But you must not forget that it is just a tool for man to use. It may be a powerful tool, but it is still a tool nonetheless.
All computers are designed to perform the same basic functions and these characteristics are mainly technical rather than aesthetic. Computers may differ in design, but in order to legally be placed into the computing market they must reach certain consumer expectations or will not be acceptable.
Most consumers are looking for a computer that is reliable, yet if the product is on the market then it is bound to have undergone and passed the numerous technological tests before release. Therefore, all computers are reliable and meet these characteristics, but it just depends upon the efficiency of the users’ computer skills as to whether they remain satisfied with their purchase.
What Are The Characteristics Of A Computer?
It is interesting to point out that as the basic characteristics of computers are all the same, technological problems with computers originate from human error and not faults within the hardware.
The computer was invented as a high-speed calculator. This has led to many scientific projects which were previously impossible. The control of the moon landing would not have been feasible without computers, and neither would today’s more scientific approach to weather prediction. If we want tomorrow’s forecast today (and not in six months time) meteorologists can use the computer to perform quickly the necessary calculations and analyses. When making flight reservations we want to know well in advance of take-off that a seat will be available – if it is not, then we have time to make other arrangements. The ability to get answersis fast enough so that one has time to take action on them (or to make alternative plans, as in the case of airline reservations) makes real-time computing possible.
Electrical pulses travel at incredible speeds and, because the computer is electronic, its internal speed is virtually instantaneous. We do not talk in terms of seconds or even milliseconds. Our units of speed are the microsecond (millionths), the nanosecond (thousand-millionths) and latterly even the picosecond (million-millionths). A powerful computer is capable of adding together two 18-digit numbers in 300 to 400 nanoseconds.
Consider two examples from non-numerical environments. The manual indexing of the complete works of Thomas Aquinas (approximately 13 million words) would have taken 50 scholars about 40 years to accomplish. With the aid of a computer a few scholars did it in less than one year. Fingerprint identification, in time to catch a criminal before he flees the country, would be impossible without computers. The first example enables us to enjoy knowledge that would otherwise be unobtainable within our own lifetime. In the second example, the police gain time to act.
Storage or Memory
The speed which computers can process large quantities of information has led to the generation of new information on a vast scale, in other words, the computer has compounded the information ‘explosion’. How can people cope with it? We can’t, but computers can. But where do they keep it all?
As a human acquires new knowledge, the brain subconsciously selects what it feels to be important and worth retaining in its memory, and relegates unimportant details to the back of the mind or just forgets them. In computers, the internal memory of the CPU is only large enough to retain a certain amount of information. It is therefore, impossible to store the records inside the computer, for example, of every Premium Bond and the names and address of their owners. All of this data is stored outside of the memory of the CPU, on auxiliary or secondary storage devices. Small sections of the total data can be accessed very quickly by the CPU and brought into the main, internal memory, as and when required for processing.
The internal memory (in CPU) is built up in 1 K or K modules, where K equals 1024 storage locations. Babbage’s Analytical Engine would have been capable of holding 1000 numbers, each of 50 digits. Computers come in many sizes. Many small micro-computers have an 8 K or 16 K store whilst ‘super computers’, such as the CDS CYBER 205 may have up to 1024 K stores (i.e. 1024 * 1024 locations).
In spite of misleading newspaper headlines, the computer’s accuracy is consistently high. Errors in the machinery can occur but, due to increased efficiency in error-detecting techniques, these seldom lead to false results. Almost without exception, the errors in computing are due to human rather than to technological weaknesses, i.e. to imprecise thinking by the programmer, or to inaccurate data, or to poorly designed systems.
Computers seem capable of performing almost any task, provided that the task can be reduced to series of logical steps. For example, a task such as preparing a payroll or controlling the flow of traffic can be broken down into a logical sequence of operations, whereas comparing the tones of a turner with a Vermeer cannot. Yet the computer itself has only limited ability and, in the final analysis, actually performs only four basic operations:
- It exchanges information with the outside world via I/O devices,
- It transfers data internally within the CPU,
- It performs the basic arithmetical operations,
- It performs operations of comparison.
In one sense, then, the computer is not versatile because it is limited to four basic functions. Yet, because so many daily activities can be reduced to interplay between these functions, it appears that computers are highly ingenious. Programming is the craft or reducing a given problem into interplay between these few operations.
A computer is much more than an adding machine, calculator or check-out till, all of which require human operators to press the necessary keys for the operations to be performed. Once a program is in the computer’s memory, the individual instructions are then transferred, one after the other, to the control unit for execution. The CPU follows these instructions until it meets a last instruction which says ‘stop program execution’. When Babbage claimed that his Analytical Engine would be automatic, he meant that once the process had begun, it would continue without the need for human intervention until completion.
Being a machine, a computer does not suffer from the human traits of tiredness and lack of concentration. If 3 million calculations have to be performed, it will perform the 3 millionth with exactly the same accuracy and speed as the first. This factory may cause those whose jobs are highly repetitive to regard the computer as a threat. But to those who rely on a continuous standard of output, e.g., quality control in the refining of oil and other chemical processes, the computer will be seen as a considerable help.
Answer the following questions
- Why should a computer undergo several technological tests before release?
- Mention two advantages of the computer’s speed.
- What is the meaning of computer’s automation?
- What is ‘information explosion’?
- Why is a computer considered of being diligent?
Describe the following terms
- Device: tool
- Reliable: reach certain expectations
- High-speed calculator: calculator which has high speed
- Nanosecond: a unit of internal speed in a computer, as large as a thousand-millionths
- Non-numerical environment: a condition which has no connection with number
- 6. Due to: because of
- Error-detecting techniques: techniques for detecting errors
- 8. Poorly designed system: system which is designed poorly
- CPU: central processing unit
In this development of information technology everyone must be familiar with the using of computers; the computer has important applications in helping users accomplish a task. Computer Application is a computer program written in a programming language and is used to solve a specific problem. This application serves to perform jobs according to user needs.
Types of computer applications
Network Applications. Computer Networking is the coordination of communication within a particular system between central (server) and some of its members. Network Topology is the pattern of relationships between terminals in a computer network. There are various types of network topology.
Graph Applications. There are many types of computers with different graph applications. Computer graphics applications beginning its development began in the late 1950s and early 1960s. It is a computer program used to draw a picture that gives a new dimension in the field of computer time. There are two obvious ways to enter information into the computer graphics into an application, namely:
- Direct Graphics Programming, by writing into the programming language.
- Digitizing (or Graphics) Tablets, by using the mouse.
Animation. Each computer may be having difference specification, so the choosing computer components must be carefully. It is a form of art that appears spontaneously to generate life movement on an object. To achieve these effects, animators have to construct a series of frames / images of a subject, that each of the next frames is slightly different from the previous frame. Animation is one of computer applications which intended to give more interesting when using computer.
Computer with a lot of animation runs slowly than one with poor of animation, so it must increase computer performance which uses many animations. There are actually several different functions to produce computer-based animation and one thereof is an animated three-dimensional (3D). One rather than the technique is to create an object which is then adjusted and moved, in which ultimately will produce a complete 3D animation. Another function is to create computer animations using a standard computer paint tools to paint the frames a single prior to the merger. This is then stored as an image file.
Web Applications. A web application is a part of computer applications, but web application is related to LAN MAN WAN concept which is part of the internet as a community computer network that provides services http (World Wide Web). Thus, the technical definition of the World Wide Web is all the resources and all the internet users that use HTTP (Hypertext Transfer Protocol). WWW is the most exciting applications on the Internet and applications such as email is very important and widely used. This application is sometimes called “The Killer Application” or “the world is at your fingertip” because we can get so easy to notice with not just text and even images, and multimedia. Every computer has a CPU as main brain, one of main components of a CPU is for support the web applications and computer development.
In this application a lot of convenience can be done such as:
- order or purchase an item online
- register online
- reach multimedia, etc
Network technology both cabling and wireless issues bought us connects everywhere. Notices are placed on the WWW called “Home Page” and every home page has the address of each. In order to attract users’ attention so that the homepage can be visited, then we have them shape it interesting and there are many clear edicts. It is necessary in this field of art, so that the world of advertising and commerce would be better. The computer applications especially web application most commonly used browser today is Netscape Navigator in the world other than Internet Explorer. Web application become the largest used application because the role of internet history. Without internet web application could not interact with people.
Application of Education
- Computer Assisted Instruction (CAI). Computers are directly used in the learning process, as a substitute teacher or a book. Some CAI applications are: Drill and Practice, Tutorials, Simulation.
- Computer Managed Instruction (CMI). The teachers use computers to plan for college, the students adapted to the conditions, which consisted of computer-assisted learning programs, reading, and exams.
- Computer Assisted Testing (CAT). Computers are used as test media. Many forms, ranging from simple where the computer (usually through the display) is used as a substitute for examination questions in paper form, to the more advanced form, where the ability of computers used to explore students’ abilities in ways actively questioning.
Application of Business / Office. Another computer application is office application. This application is used for business purpose, every business, large or small, to process large amounts of data in daily operations. Data obtained from the payroll, customer invoicing and financial accounts, inventory management, and account customers that all fees must be calculated, stored, classified, sorted, retrieved, processed again, reported, communicated and disseminated at a time. Processing of such data is known as Business Data Processing or Data Processing (DP). If the processing is done by computer, this is known as Electronic Data Processing (EDP). Now every office’s employee must be able operate computer, so they must know how to use computer to make their job easy.
DBMS (Data Base Management System). Computers also can be used as Effective in business management. Through a computerized database management system (DBMS) and the SIM, a manager or company executive can be assisted in making decisions about the entire business operation and to provide guidance and instructions to subordinates. DBMS types which are common used nowadays are relational database and RDBMS concept.
Application for a Certain Class
- Air Traffic Control System
- Airline Reservation Systems
- READING COMPREHENSION
1. What is Computer Application?
2. What are the functions of animation application?
3. Describe the computer networking.
4. Describe the terms WWW and HTTP.
5. What is “Killer Application”?
6. What can we do when using web application?
- B. “Compound sentence” is a sentence which consists of two or more simple sentences joined by a connector such as: and, or, so, yet, but. Fill in the blanks with the correct connectors.
1. Tom is reading, …………………… his friends are watching TV.
2. It rains outside, …………………… I take my umbrella.
3. We must clean the room, …………………… the caretaker will do it.
4. She is tall, …………………………… she is not good in basketball.
5. You can eat fruit for dessert, ………………. you can have some ice cream.
- Make a compound sentence by combining these simple sentences.
- a. You may not be able to upgradelaptops as much as a desktop.
b. It’s possible to add more RAM or a bigger hard drive.
2. a. A computer accepts information in the form ofdigitalized data.
b. It manipulates the data for some result based on a program.
3. a. A server can look like a regular desktop computer.
b. It can be much larger.
4. a. Laptops are more portable.
b. You can use them almost anywhere.
5. a. A program may be invariable and built into the computer.
b. Different programs may be provided to the computer.
A peripheral (pronounced peh-RIHF-uh-ruhl, a noun truncation of peripheral device,) is any computer device that is not part of the essential computer (the processor, memory, and data paths) but is situated relatively close by. A near synonym is input/output (I/O) device. Some peripherals mounted in the same case with the main part of the computer are the hard disk drive, CD-ROM drive, and NIC. Other peripherals are outside the computer case, such as the printer and image scanner, attached by a wired or wireless connection.
Computer peripherals are add-on hardware to the computer to expand its abilities or improve its performance. By adding memory, computers are able to perform a lot better, or by adding video cards, the computers graphics create more detail. These are just some of the peripherals, although there is a lot more you can put on your PC. Some of them may not be compatible.
Compatibility maybe an issue to some of the peripherals and may even cause the worst outcome – the PC refuses to boot or the PC refuses to recognize the peripheral being added. The easiest way to solve that would be figuring out where it is started and you can start from there.
Narrow down the problem and re-check the connections – specially the cards you just added-in. Checking the wires and screws make a difference. And every time you install a new add-on card, and it suppose to be plug-and-play but it is not, maybe because you made a mistake in the installation process. Do not panic. Go through the whole process again and then try once more. If still nothing is solved then maybe there might be a compatibility problem.
Technically, every piece of hardware inside your PC requires a driver to communicate and function with the operating system, the software applications, and other hardware components in your computer. Software drivers basically translate messages from and to the hardware in question and the operating system, allowing your computer system to work as a whole— theoretically. Generally, though appearances may be deceiving, any computer system is actually made up of a bunch of specialized pieces that do not communicate the low level language of other peripherals and, therefore, needs a great deal of translation to be able to talk and work effectively with them.
These facts may not solve all the hardware problems you may run into, however, they should solve a good number of them. The important thing to remember when trying to do any trouble-shooting job is that computers really are just logical devices and there is always a logical reason behind why things just not suppose to react the way they are. Finding what is that reason and then putting the right solution is not always easy, but if you approach the problem logically and work through it step-by-step, there is a very good chance you will be able to solve it by yourself.
Answer the following questions.
- What is the best description for peripherals?
- What is another name for a peripheral?
- Give some examples of peripherals.
- What is one issue/problem of peripherals put on a PC?
- How does a driver work in a computer system?
What is the meaning of these words?
- Compatible: suitable
- To boot: to get/recognize the addition
- To figure out: to know, to understand
- To narrow down: to limit
- To deceive: to make a trick
- To run into: to meet accidently
- Trouble-shooting: problem solving
Fill in the blanks with the words above
- Sorry, I’m late. I …………………………………………..an old friend on the street and we talk for a while.
- This new device is not ……………………………………………. with the old ones, therefore it doesn’t work.
- This topic is too broad. We need to …………………………… it …………………………… so that it is easier to discuss.
- I received a car and some gasoline to ………………………………….
- They have worked hard for several weeks to finish this ……………………………………..job.
- We need to ……………………………………the problem first then we can solve it.
- Don’t believe in that man, his appearance is ………………………………………………….
Computer Capabilities and Limitations
We see computer everywhere: at home, in school, in the hospital, in the bank, in bookstores and department stores, at recreation centers and in many other places. They are important pieces of equipment and they help man in so many ways. Many people depend so much on computers. They use computers to do their work, to have fun, to keep in touch with their loved ones, to store important documents and so on. Why is this so? That is because computers are capable of doing so many things.
The following items are the capabilities of a computer:
Speed. The computer processes information very fast. Would you believe that computer can get the average of a million sets of numbers in a few seconds by pressing a button? It is like getting the sum or total of one hundred different sets of numbers in one click. With a speed reaching up to fifty million operations per second, a computer can process data faster than any other machine designed to perform a similar task. That is, adding two numbers is considered as one operation
Accuracy. The computer gives accurate results. Some scientists use the computer in their experiments. The needed data for their experiments are processed in the computer. They can get almost perfect and more accurate results through it. High-speed processing by a computer is accompanied by high-accuracy results. A computer can be considered 100% accurate. The electronic circuitry of computers is such that, when the machines are fed with correct instructions or data and when the incoming data is error-free, the accuracy of the output is relatively assured.
Compact storage. The computer stores large amount of data and information. Most computers have storage or accessories wherein the user can save information or document. These are called floppy diskettes, hard disks and zip disks. A computer has the ability to store large amounts of data in compact and easily retrievable form. It can store data at a very high speed.
Repetitiveness. A computer can perform the same operation a million times in exactly the same way. The various operations are executed automatically by way of stored computer programs. The computer enables one to restore or bring back any of his works. You try to bring your old work when you want to make another copy of it, or when you want to change something in it. A computer makes all these possible.
It is automatics. You don’t have to wait long for a computer to do a certain job. Most of the time, you just have to click a button and the computer’s processor will do the rest of the work.
The computer can do two things at the same time. You may open two or more programs at the same time. You may work with the first one while you minimize or hide the other program.
Logical operations. The computer can make a decision based on alternative courses of action. The decisions of a computer are, however, dependent on the programs prepared for it by the programmer. A decision consists of two steps, namely:
a. Determining if a certain statement is true or false.
b. Based on the result of the first step, choosing one or the other course of action out of the alternatives provided in the computer program.
Discipline means that a computer can self-check and self-operate. A computer self-checks when it verifies the accuracy of its own work by means of a parity (kesamaan/keseimbangan) check. In a parity check, the computer counts the number of characters it has stored to make sure that there will be no loss of data during processing. In self-operation, a computer is capable of executing instructions on its own, without human intervention, once the program and the data are fed into the computer’s memory.
The computer can be improved and upgraded. The computer is unlike other machines or appliances that your parents discard or throw away when they do not function properly anymore. Today, it is very easy to replace damaged and obsolete computer parts. You just have to go to the nearby computer store or ask a service technician to do installation and repair work for your computer.
Limitations of a Computer
However, the computer is not a super machine. Thus, it has its own limitations, like the following:
- The computer can only do what you tell it to do. Do not expect the computer to give you something which you never tell it to do. It will only give you what you ask it.
- It cannot generate information on its own. Your computer depends on you. It will not run unless you operate it. In the same way, it cannot give you information you need if you do not feed it with the necessary data. While it is true that a computer has the capacity to put together information from many sources, it can only do this if it has been programmed by man to do so.
- The computer will give you wrong information if you feed it with wrong data. The computer cannot distinguish between correct data and wrong data. Thus, if you feed your computer with wrong data, it will result with the computer giving wrong information.
- The computer cannot correct wrong instruction. If you give the computer wrong instruction, it will not be able to do anything to correct it. It will only stop functioning. Then, the computer will depend on you to correct your mistake. A computer cannot correct wrong instruction. If a computer is fed with incorrect instructions or data, whether intentionally or unintentionally, it does not have the capability to detect mistakes and correct them. In computer language, this is known as GIGO (garbage in garbage out). This means that a computer that has been fed with a wrong set of instructions or data will similarly produce wrong information and wrong decisions. Therefore, any corrections must be done by the programmer.
(Source: ///Cybertech/Luz Pingol ©2010 SlideShare Inc.; ///people/denz/siplever © Copyright 2008-2012 Webika Ltd.)
A. Make a simple sentence by using these words.
1. personal computer
4. do ……………… ?
5. does ………….. ?
B. combine these sentences into a compound sentence by using a connector: and, or, but, so
6. Computers are important pieces of equipment, ……………….. they help man in so many ways.
7. All computers are reliable, …………………………..…… it depends upon the efficiency of the computer
8. Laptops are more portable, ………………….….. you can use them almost anywhere.
9. You can go to the nearby computer store, ……………..you ask a service technician to do installation
and repair work for your computer.
Hardware and software
Books provide a useful analogy. The pages and the ink are the hardware, while the words, sentences, paragraphs, and the overall meaning are the software. A computer without software is like a book full of blank pages — you need software to make the computer useful just as you need words to make a book meaningful. Hardware refers to objects that you can actually touch, like disks, disk drives, display screens, keyboards, printers, boards, and chips. In contrast, software is untouchable. Software exists as ideas, concepts, and symbols, but it has no substance.
Hardware refers to the physical elements of a computer. It is also referred to as the machinery or the equipment of the computer. Examples of hardware in a computer are the keyboard, the monitor, the mouse and the processing unit. However, most of a computer’s hardware cannot be seen; in other words, it is not an external element of the computer, but rather an internal one, surrounded by the computer’s casing. A computer’s hardware is comprised of many different parts, but perhaps the most important of these is the motherboard. The motherboard is made up of even more parts that power and control the computer.
In contrast to software, hardware is a physical entity, while software is a non-physical entity. Hardware and software are interconnected, without software, the hardware of a computer would have no function. However, without the creation of hardware to perform tasks directed by software via the central processing unit (box), software would be useless.
Software refers to the operating system and all utilityprograms that manage computerresources at a low level. Software is generally divided into systems software and applications software. Applications software comprises programs designed for an end user, such as word processors, database systems, and spreadsheet programs. Systems software includes compilers, loaders, linkers, and debuggers.
The term “software” is sometimes used in a broader context to describe any electronic media content which embodies expressions of ideas such as film, tapes, records, etc. Software is the electronic instruction that tells the computer to do a task.
Software, commonly known as programs, consists of all the electronic instructions that tell the hardware how to perform a task. These instructions come from a software developer in the form that will be accepted by the operating system that they are based on. For example, a program that is designed for the Windows operating system will only work for that operating system. Compatibility of software will vary as the design of the software and the operating system differ. A software that is designed for Windows XP may experience compatibility issue when running under Windows 2000 or NT.
Software can also be described as a collection of routines, rules and symbolic languages that direct the functioning of the hardware.
Software is capable of performing specific tasks, as opposed to hardware which only perform mechanical tasks that they are mechanically designed for. Practical computer systems divide software systems into three major groups:
- System software: Helps run computer hardware and computer system. Computer software includes operating systems, device drivers, diagnostic tools and more.
- Programming software: Software that assists a programmer in writing computer programs.
- Application software: Allows users to accomplish one or more tasks.
- What is hardware?
- What is software?
- What are the differences between hardware and software?
- Software system is divided into three major groups. What are they?
What is Mainframe?
As we all know the term mainframe when said to a layman would give a feeling of a large computer, but the question arise how large it is and what is the specialty of these mainframes. The answer to this question lies in the term “Mainframe” itself. As the name implies, mainframe is the main computer with all units processing. Communications are built into a frame and hence the name Mainframe, which thereby denotes a very large computer.
Mainframes have huge processing and storage capacity. The development cost involved with mainframes is also very huge and therefore mainframes are manufactured only by very large companies. Mainframe gets its usage and applications in banking and financial sectors where large-scale operation with millions of records per day is involved.
Apart from the above there is also enterprise class mainframe integration which has greater features and ability of connecting mainframe data sources to distributed platforms. Thus, with specific, specialized and powerful features of mainframes like security, high performance, reliability, scalability and manageability are achieved and provided to distributed applications using mainframe resources.
History and Evolution of Mainframes:
Some of the early mainframes which were developed starting from the year of 1942 are ENIAC, MARK1, BINAC, and UNIVAC. ENIAC is also called as electronic numerical integrator and calculator was developed in the year 1942. This mainframe machine weighed in tones and consumed enormous electric power. It had thousands of vacuum tubes, relays resistors, capacitors, and inductors inside it.
In the year 1951, UNIVAC-I was developed specially for the US Census Bureau. The major difference between UNIVAC and ENIAC was the processing of digits. In UNIVAC, processing was done in serial mode, yet the speed of UNIVAC was higher than ENIAC with one disadvantage of vacuum tubes generating enormous amount of heat which made the mandatory requirement of a large good air conditioning system.
Later in 1954, Univac II was developed. In 1962, the concept of virtual memory, a powerful feature which shall be discussed in later sections, was introduced in mainframes making the system even more powerful.
In 1964, the first third generation computer named as Burroughs B5000 came into market. This mainframe system had various powerful specialized features like multiprogramming, multiprocessing and virtual memory.
Later on various improved versions of Burroughs series came into market with new features in each. Among this the most notable one was B6700 which came in the year 1971 and this supported the feature of dynamic linking of programs at runtime.
IBM was producing and releasing mainframes in the market at all periods from past till present with the successive development of IBM Series starting with System/360.
One of the biggest factors associated with mainframes is its huge cost which made its usage only possible for big companies and corporate. There are still many technical terms one must get familiarized with mainframe systems to understand about mainframe systems in depth.
Let us see some of the internal technical usage of mainframe system.
A mainframe channel connect to one or more controllers via either pairs of large “bus and tag” cables or, fiber optic ESCON (Enterprise System CONnection) cables and FICON, which has the ability controlling one or more devices. This is one of the important terms in mainframe technology since it has the ability of take care of huge input and output functions.
DASD stands for Direct Access Storage Device. This indicates to any type of storage that was directly (randomly) addressable.
LPAR stands for Logical Partition and is a powerful hardware or firmware feature implemented in all mainframe systems. By this feature it is possible to create partitions and by which CPUs and I/O sub-systems can be shared between logical partitions.
- What is the best description for mainframe?
- What is the specialty of mainframe?
- Make a brief description of mainframe history.
- What are some examples of the usage of mainframe system? Explain briefly.
|What||do/did||you||give to her?|
|Where||we||put this report?|
|How||it||go up there?|
- I give her some flowers.
- Let’s put the report on the teacher’s desk.
- They go home in the evening.
- They arrived at 7 o’clock this morning.
- She cried because she lost her money.
- He met his old friend.
- The cat climbed the tree.
Make the questions of these sentences
- I wake up at five o’clock every day.
- They go to school by bus.
- The little girl drinks some milk.
- Mr. Rowland repairs the bicycle with some tools.
- We meet the doctor at the hospital.
- The baby cried because it was hungry.
- The man bought the car at the exhibition.
- You submitted the paper yesterday.
|How much sugar||do||you||need?||Two kilos|
|How many books||did||she||buy?||Five books|
|How often||does||he||do sport?||Twice a week|
|How fast||does||the car||run?||100km/hour|
|How long||did||he||stay?||A month|
|How far||do||they||walk?||50 km|
|What kind of ice||do||you||like?||Chocolate ice cream|
The branch of computer science concerned with making computers behave like humans. The term was coined in 1956 by John McCarthy at the Massachusetts Institute of Technology. Artificial intelligence includes
- games playing: programming computers to play games such as chess and checkers
- expert systems : programming computers to make decisions in real-life situations (for example, some expert systems help doctors diagnose diseases based on symptoms)
- natural language : programming computers to understand natural human languages
- neural networks : systems that simulate intelligence by attempting to reproduce the types of physical connections that occur in animal brains
- robotics : programming computers to see and hear and react to other sensory stimuli
Currently, no computers exhibit full artificial intelligence (that is, are able to simulate human behavior). The greatest advances have occurred in the field of games playing. The best computer chess programs are now capable of beating humans. In May, 1997, an IBM super-computer called Deep Blue defeated world chess champion Gary Kasparov in a chess match.
In the area of robotics, computers are now widely used in assembly plants, but they are capable only of very limited tasks. Robots have great difficulty identifying objects based on appearance or feel, and they still move and handle objects clumsily.
Natural-language processing offers the greatest potential rewards because it would allow people to interact with computers without needing any specialized knowledge. You could simply walk up to a computer and talk to it. Unfortunately, programming computers to understand natural languages has proved to be more difficult than originally thought. Some rudimentary translation systems that translate from one human language to another are in existence, but they are not nearly as good as human translators. There are also voice recognition systems that can convert spoken sounds into written words, but they do not understand what they are writing; they simply take dictation. Even these systems are quite limited — you must speak slowly and distinctly.
In the early 1980s, expert systems were believed to represent the future of artificial intelligence and of computers in general. To date, however, they have not lived up to expectations. Many expert systems help human experts in such fields as medicine and engineering, but they are very expensive to produce and are helpful only in special situations.
Today, the hottest area of artificial intelligence is neural networks, which are proving successful in a number of disciplines such as voice recognition and natural-language processing.
There are several programming languages that are known as AI languages because they are used almost exclusively for AI applications. The two most common are LISP and Prolog.
- Describe the term “Artificial Intelligence”.
- Mention the fields of Artificial Intelligence.
- e. ………………………………………………………………………….
- Give examples for each field of AI.
Computer Operating Systems
Operating system refers to the most important program that runs on a computer. Every general-purpose computer must have an operating system to run other programs. Operating systems perform basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as disk drives and printers. The purpose of an operating system is to organize and control hardware and software so that the device it lives in behaves in a flexible but predictable way.
For large systems, the operating system has even greater responsibilities and powers. It is like a traffic cop – it makes sure those different programs and users running at the same time do not interfere with each other. The operating system is also responsible for security, ensuring that unauthorized users do not access the system.
All desktop computers have operating systems. The most common are the Windows family of operating systems developed by Microsoft, the Macintosh operating systems developed by Apple and the UNIX family of operating systems (which have been developed by a whole history of individuals, corporations and collaborators). There are hundreds of other operating systems available for special-purpose applications, including specializations for mainframes, robotics, and manufacturing, real-time control systems and so on.
For a desktop computer user, this means you can add a new security update, system patch, new application or even an entirely new operating system rather than junk your computer and start again with a new one when you need to make a change. As long as you understand how an operating system works and how to get at it, in many cases you can change some of the ways it behaves. The same thing goes for your phone, too.
How Operating Systems Work
When you turn on your computer, it’s nice to think that you’re in control. There’s the trusty computer mouse, which you can move anywhere on the screen, summoning up your music library or Internet browser at the slightest whim. Although it’s easy to feel like a director in front of your desktop or laptop, there’s a lot going on inside, and the real man behind the curtain handling the necessary tasks is the operating system.
As a user, you normally interact with the operating system through a set of commands. For example, the DOS operating system contains commands such as COPY and RENAME for copying files and changing the names of files, respectively. The commands are accepted and executed by a part of the operating system called the command processor or command line interpreter. Graphical user interfaces allow you to enter commands by pointing and clicking at objects that appear on the screen.
Most desktop or laptop PCs come pre-loaded with Microsoft Windows. Macintosh computers come pre-loaded with Mac OS X. Many corporate servers use the Linux or UNIX operating systems. The operating system (OS) is the first thing loaded onto the computer – without the operating system, a computer is useless.
More recently, operating systems have started to pop up in smaller computers as well. If you like to tinker with electronic devices, you’re probably pleased that operating systems can now be found on many of the devices we use every day, from cell phones to wireless access points. The computers used in these little devices have gotten so powerful that they can now actually run an operating system and applications. The computer in a typical modern cell phone is now more powerful than a desktop computer from 20 years ago, so this progression makes sense and is a natural development.
When you turn on the power to a computer, the first program that runs is usually a set of instructions kept in the computer’s read-only memory (ROM). This code examines the system hardware to make sure everything is functioning properly. This power-on self test (POST) checks the CPU, memory, and basic input-output systems (BIOS) for errors and stores the result in a special memory location. Once the POST has successfully completed, the software loaded in ROM (sometimes called the BIOS or firmware) will begin to activate the computer’s disk drives. In most modern computers, when the computer activates the hard disk drive, it finds the first piece of the operating system: the bootstrap loader.
The bootstrap loader is a small program that has a single function: It loads the operating system into memory and allows it to begin operation. In the most basic form, the bootstrap loader sets up the small driver programs that interface with and control the various hardware subsystems of the computer. It sets up the divisions of memory that hold the operating system, user information and applications. It establishes the data structures that will hold the myriad signals, flags and semaphores that are used to communicate within and between the subsystems and applications of the computer. Then it turns control of the computer over to the operating system.
Operating systems provide a software platform on top of which other programs, called application programs, can run. The application programs must be written to run on top of a particular operating system. Your choice of operating system, therefore, determines to a great extent the applications you can run. For PCs, the most popular operating systems are DOS, OS/2, and Windows, but others are available, such as Linux.
Types of Operating Systems
Within the broad family of operating systems, there are generally four types, categorized based on the types of computers they control and the sort of applications they support. The categories are:
- Real-time operating system (RTOS) – Real-time operating systems are used to control machinery, scientific instruments and industrial systems. An RTOS typically has very little user-interface capability, and no end-user utilities, since the system will be a “sealed box” when delivered for use. A very important part of an RTOS is managing the resources of the computer so that a particular operation executes in precisely the same amount of time, every time it occurs. In a complex machine, having a part move more quickly just because system resources are available may be just as catastrophic as having it not move at all because the system is busy. Real-time responds to input instantly. General-purpose operating systems, such as DOS and UNIX, are not real-time.
- Single-user, single task – As the name implies, this operating system is designed to manage the computer so that one user can effectively do one thing at a time. The Palm OS for Palm handheld computers is a good example of a modern single-user, single-task operating system.
- Single-user, multi-tasking – This is the type of operating system most people use on their desktop and laptop computers today. Multi-tasking allows more than one program to run concurrently. Microsoft’s Windows and Apple’s Mac OS platforms are both examples of operating systems that will let a single user have several programs in operation at the same time. For example, it’s entirely possible for a Windows user to be writing a note in a word processor while downloading a file from the Internet while printing the text of an e-mail message.
- Multi-user – Multi-user allows two or more users to run programs at the same time. Some operating systems permit hundreds or even thousands of concurrent users. A multi-user operating system allows many different users to take advantage of the computer’s resources simultaneously. The operating system must make sure that the requirements of the various users are balanced, and that each of the programs they are using has sufficient and separate resources so that a problem with one user doesn’t affect the entire community of users. UNIX, VMS and mainframe operating systems, such as MVS, are examples of multi-user operating systems.
- Other types:
-. Multiprocessing : Supports running a program on more than one CPU.
-. Multithreading : Allows different parts of a single program to run concurrently.
It’s important to differentiate between multi-user operating systems and single-user operating systems that support networking. Windows 2000 and Novell Netware can each support hundreds or thousands of networked users, but the operating systems themselves aren’t true multi-user operating systems. The system administrator is the only “user” for Windows 2000 or Netware. The network support and all of the remote user logins the network enables are, in the overall plan of the operating system, a program being run by the administrative user.
Operating System Functions
At the simplest level, an operating system does two things:
- It manages the hardware and software resources of the system. In a desktop computer, these resources include such things as the processor, memory, disk space and more (On a cell phone, they include the keypad, the screen, the address book, the phone dialer, the battery and the network connection).
- It provides a stable, consistent way for applications to deal with the hardware without having to know all the details of the hardware.
The first task, managing the hardware and software resources, is very important, as various programs and input methods compete for the attention of the central processing unit (CPU) and demand memory, storage and input/output (I/O) bandwidth for their own purposes. In this capacity, the operating system plays the role of the good parent, making sure that each application gets the necessary resources while playing nicely with all the other applications, as well as husbanding the limited capacity of the system to the greatest good of all the users and applications.
The second task, providing a consistent application interface, is especially important if there is to be more than one of a particular type of computer using the operating system, or if the hardware making up the computer is ever open to change. A consistent application program interface (API) allows a software developer to write an application on one computer and have a high level of confidence that it will run on another computer of the same type, even if the amount of memory or the quantity of storage is different on the two machines.
Even if a particular computer is unique, an operating system can ensure that applications continue to run when hardware upgrades and updates occur. This is because the operating system – not the application – is charged with managing the hardware and the distribution of its resources. One of the challenges facing developers is keeping their operating systems flexible enough to run hardware from the thousands of vendors manufacturing computer equipment. Today’s systems can accommodate thousands of different printers, disk drives and special peripherals in any possible combination.
By Curt Franklin and Dave Coustan)
Answer these questions
- What does operating system (OS) refer to?
- What are some examples of OS?
- How does OS work? Make it brief by giving some steps.
- Name the types of OS and explain briefly.
- What are the functions of OS?
¢ Jane went inside because it was raining.
¢ Before you leave, I will sign the paper.
¢ I will leave at 7:00 if I am ready.
¢ Although Bob felt sick, he went to school.
¢ I know when he will arrive.
¢ We don’t know who will do the work.
¢ What was on television made me angry.
¢ I liked the book which you recommended.
¢ The woman is filling the glass that is on the table.
¢ The glass that is on the table contains fresh water.