COMPUTER SYSTEM ARCHITECTURE
All computer systems perform different functions. They input, store, process, control, and output data. There are several computer system units that perform these functions. Let's examine computer systems from the point of view of the system designer, or architect.
Computers and their accessory equipment are designed by a computer system architect. He usually has a strong engineering background. The analyst uses a computer to solve specific problems, when the computer system architect usually designs computer that can be used for many different applications in many different businesses. For example, the product lines of major computer manufacturers such as IBM, Digital Equipment Corporation and many others are the result of the efforts of teams of computer system architects.
A potential user, applications programmer or systems analyst must understand only the functions of the major units of a computer system and how they work together.
Types of computers
The two basic types of computers are analog and digital. Analog computers simulate physical systems. They operate on the basis of an analogy to the process that is studied. For example, a voltage may be used to represent other physical quantities such as speed, temperature, or pressure. The response of an analog computer is based upon the measurement of signals that vary continuously with time. Analog computers are used in applications that require continuous measurement and control.
Digital computers deal with discrete rather than continuous quantities. They count rather than measure. They use numbers instead of analogous physical quantities to simulate on-going, or real-time processes. Because they are discrete data, commercial transactions are in a natural form for digital computation. This is one reason that digital computers are so widely used in business data processing.
Machines that combine both analog and digital capabilities are called hybrid computers. Many business, scientific and industrial computer applications rely on the combination of analog and digital devices. The use of combination analog devices will continue to increase with the growth in applications of microprocessors and microcomputers. An example of this growth is the trend toward installing control systems in household appliances such as microwave ovens and sewing machines. In the future we will have complete indoor climate control systems and robots to do our housecleaning. Analog sensors will provide inputs to the control centres of these systems, which will be small digital computers.
Answer the following questions:
1. Who designs computers and their accessory equipment? 2. What is the role of an analyst? 3.What functions do computer systems perform? 4. What types of computers do you know? 5.What is the principle of operation of analog computers? 6. How do digital computers differ from analog computers? 7.What are hybrid computers? 8. Where do they find application?
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VOCABULARY EXERCISES
Exercise 1. :
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Exercise 2. .
1. Computer and their _____ equipment are designed by a computer system architect. (engineering, accessory, specific)
2. Digital computers use numbers instead of analogous physical _____.
(symbols, equipment, quantaties)
3. Computers can store, retrieve and organize much more information than ____ of humans possess. (capabilities, capacities, accuracy)
4. The analyst ______ a computer for solving problems, while the computer system architect ________computers. (requires, designs, uses)
5. The use of ____ computers will continue to increase with the growth in applications of microprocessors and minicomputers. (analog, digital, hybrid)
GRAMMAR EXERCISES
Exercise 1. , one, that, those.
1. One more advantage of microelectronics is that smaller devices consume less power. 2. In analogue computer the agreement is a mathematical one. 3. One uses computers in all forms of automatic control industry. 4. In one hour the machine can perform this work. 5. One of the most important developments of the 20th century is the computer. 6. This computing machine differs from that computer. 7. She says that it is the latest model. 8. This is the computer that your brother will buy. 9. Some features of this minicomputer are better than those of that desktop computer. 10. Mini computers have a size, power and cost between those of microcomputers and mainframes. 11. Look at the other alternatives to choose the best one. 12. The arrangement of keys on a computer keyboard is very similar to that on a typewriter keyboard.
Exercise 2. one/ones.
1.There are several methods that can be used and we will look at each method with its advantages and disadvantages. 2. There is a variety of computer languages and the language that is chosen for a particular job depends on the job that is being done. 3. A zip file is a file that has been compressed before being put on the disk. 4. Faster storage devices are used and the main storage devices are as follows. 5. Notebooks have no mouse, although you can connect a mouse. 6. Another device, and very effective device, is the mouse. 7. Simple BASIC programs can be written right at the terminal. Complex programs require programming technique. 8. You can replace the current drive with the drive that stores more. 9. Replace old versions of your documents with newer versions. 10. The modem converts the analogue signal back into digital signal.
