Учебное пособие содержит: тексты из оригинальной литературы, посвященные теме «Компьютеры и информационные системы»

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Название	Учебное пособие содержит: тексты из оригинальной литературы, посвященные теме «Компьютеры и информационные системы»
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Тип	Учебное пособие

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Participle I, Participle II, Perfect
Participle Active и Perfect Participle Passive.

1. Electromechanical memories depend upon moving mechanical parts for their operation. 2. The time required for the computer to locate and transfer data to and from a storage medium is called the access time. 3. Being not visible software makes possible the effective operation of computer system. 4. Having invented magnetic tapes the Germans used them as the secondary storage medium. 5. When properly programmed computers don't make computational errors. 6. Having been introduced in the early 1960s magnetic disc storage has replaced magnetic tape storage. 7. The control unit interpreting instructions is one of the important parts of any computer system. 8. Data recorded in the form of magnetized dots can be arranged to represent coded patterns of bits. 9. As contrasted with magnetic tapes magnetic discs can perform both sequential and random processing. 10. While having no moving mechanical parts electronic memories can transfer data at very high speed.

14. Выполните письменный перевод текста по вариантам.

DIGITAL COMPUTER OPERATION

1. A digital computer is a machine capable of performing operations on data represented in digital or number form. The individual operations performed by a digital computer are very simple arithmetic or logical processes involving the manipulation of the bits in words or characters of information. The great power of any digital computer rests in the ability to store large volumes of data and to perform these operations at extremely high speed.

In most electronic digital computers the method of number representation is based on the system of binary notation. The binary notation system is most widely used because of the convenience in constructing logical circuits and storage devices capable of handling data in this form. For example, a magnetic memory unit consists of many thousand individual magnetic cells, each of which can be energized in either of two ways to represent the binary digits 0 or 1. If these cells are grouped to form words or binary coded characters, information can be

Английский язык. Основы компьютерной грамотности 94

s

tored for processing in units of specified size. In the same way, digital data can be recorded as a series of magnetized spots on a magnetic tape or a magnetic disk.

2. The computer has pervaded most fields of human activity and is the most important innovation of our age. Born out of the technology of communication, it is capable of handling enormous amounts of information at tremendous speeds. What makes it so potent is the fact that a single mechanism can perform any information-processing task. The same mechanism can control industrial processes, guide space vehicles or help to teach children. This diversity of tasks is made possible by the simple idea of the stored program.

A program is the enumeration of determining commands. It specifies the method used for the solution of a problem in detail. When the machine is. in operation, both the commands and the numbers to be processed are constantly being taken out of and put into a depository of information known as a memory.

It can be seen that the processes performed by a digital computer are essentially simple. These operations can be performed at extremely high speeds and with a high degree of coordination between the different functional units of the hardware system, and this ability means that digital computers can undertake highly complex tasks.

15. Прочтите внимательно текст. Составьте на английском языке план текста, выделив основные его темы. План можно составить в вопросной, назывной или тезисной форме. Познакомьтесь с образцами планов, представленными после текста; сравните со своим планом.

MEMORY

It is interesting to note that memory, one of the basic components of the computer, is often called storage. It stores calculation program, the calculation formulae, initial data, intermediate and final results. Therefore, the functions of the computer memory may be classified in the following way. Firstly, the computer memory must store the information transmitted from the input and other devices. Secondly, memory should produce the information needed for the computation process to all other devices of the computer.

95 Unit 7. Storage

G

enerally, memory consists of two main parts called the main, primary or internal, memory and the secondary, or external memory. The advantage of the primary memory is an extremely high speed. The secondary memory has a comparatively low speed, but it is capable of storing far greater amount of information than the main memory. The primary storage takes a direct part in the computational process. The secondary storage provides the information necessary for a single step in the sequence of computation steps.

The most important performance characteristics of a storage unit are speed, capacity and reliability. Its speed is measured in cycle time. Its capacity is measured by the number of machine words or binary digits. Its reliability is measured by the number of failures (отказ) per unit of time.

План в вопросной форме.

What is memory?
What is the function of memory?
What are the main parts of memory?
What are advantages and disadvantages of a storage unit?
What are their functions?
What are performance characteristics of the main and
secondary memory?
What units are performance characteristics measured by?

План в назывной форме

The definition of memory.
The main functions of memoiy.
Classification of memory.
Advantages and disadvantages of memory components.
The functions of memory components.
Performance characteristics of memory.

The units for measuring the performance characteristics
of memory.

План в тезисной форме.

Memory is one of the basic components of the comput
er.

Memory stores initial data, intermediate and final results.

It produces the information needed to other devices of
the computer.

Английский язык. Основы компьютерной грамотности 96

Memory consists of the main (internal) and the second
ary (external) storage.
The main memory has high speed, but small capacity; the
secondary memory possesses lower speed but greater ca
pacity.
The main memory performs computation; the secondary
memory provides information sequentially, step by step.
The performance characteristics — speed, capacity and
reliability — are measured by cycles, binary digits and the
number of failures per unit of time.

TESTS 1. Вставьте вместо пропусков необходимые слова.

1. The time required for the computer to locate and transfer
data in the storage device is called the data time.

a) sequence; b) access; c) value

2. memories have no moving parts.

a) electronic; b) mechanical; c) electromechanical

3. Magnetic were the main elements used for pri
mary memory in digital computers for many years.

a) cores; b) tapes; c) disks

4. is more commonly used for memory at present.

a) bipolar semiconductor; b) MOS; c) field-effect transistor

5. Magnetic disks constitute the storage media.

a) internal; b) primary; c)secondary

6. Data are stored in codes in primary as well as in

secondary storage.

a) digital; b) binary; c) numerical

7. Data access time is in electronic memories than

that in electromechanical memories.

a) longer; b) much longer; c) shorter

8. Electronic memories have capacities for data stor-

age.

a) more; b) larger; c) less

97 Unit 7. Storage

2

. Согласуйте слова левой колонки с их интерпретацией, предложенной справа.

1. Primary a) one of the performance characteris-

tics of storage measured in binary digits;

2. Secondary b) memory that has random access to

the information;

Magnetic disc c) combination of units of information;
Binary codes d) the main method of secondary stor-

age performing both sequential and random storage;

5. RAM e) area of memory where protected pro-

grams can be read from but not written on;

6. Bit f) a fixed number of consecutive bits

representing a character;

7. Byte g) the principal flexible second storage

circuit element;

8. ROM h) part of memory having lower speed

but greater capacity;

9. Floppy i) a unit of information or binary digit;

10. Capacity . j) the most expensive part of memory

having the least capacity and the fastest access time.

Unit 8 CENTRAL PROCESSING UNIT

1 Ознакомьтесь с терминами текста 1.

central processing unit (CPU) - центральный процессор

(ЦП)

interchangeably [,mt₃'tfemd33bli] - взаимозаменяемым

образом

precisely [pn'saish] — точно

internal memory - внутренняя память; внутреннее ЗУ activity [sk'tiviti] - деятельность; работа; действия операции to issue ['isju:] - посылать (сигнал); выводить, выдавать

(сообщение) response [n'spons] - ответ; отклик; реакция; отвечать;

реагировать

to interprete [m'tspnt] - интерпретировать; истолковывать;

according to [a'bdin ts] - согласно; в соответствии с level - уровень; степень; мера; выравнивать input-output port - порт ввода-вывода control unit (CU) [bn'troul 'ju:nit] - устройство управления arithmetic-logical unit (ALU) - арифметико-логическое

устройство

switch ['switJl - переключатель; коммутатор; переключать; переходить direct [di'rekt] - направлять; адресовать; указывать;

прямой; непосредственный step-by-step operations - пошаговые операции to select [ss'lekt] - выбирать; выделять (на экране) on the other hand - с другой стороны exponentiation [ekspe'nenji'eifn] - возведение в степень

99 Unit 8. Central Processing Unit

c

all for — требовать; предусматривать

to load ['loud] — загружать; выполнять загрузку

2. Прочтите текст и скажите, какой компонент составляет сердце компьютерной системы и в чем заключается его функция.

Text 1. CENTRAL PROCESSING UNIT

It is well known in computer science that the words 'computer' and 'processor' are used interchangeably. Speaking more precisely, 'computer* refers to the central processing unit (CPU) together with an internal memory. The internal memory, control and processing components make up the heart of the computer system. Manufactures design the CPU to control and carry out basic instructions for their particular computer.

The CPU coordinates all the activities of the various components of the computer. It determines which operations should be carried out and in what order. The CPU controls the operation of the entire system by issueing commands to other parts of the system and by acting on responses. When required it reads information from the memory, interprets instructions, performs operations on the data according to the instructions, writes the results back into the memory and moves information between memory levels or through the input-output ports.

In4igital computers the CPU can be divided into two functional units called the control unit (CU) and the arithmetic-logical unit (ALU). These two units are made up of electronic circuits with millions of switches that can be in one of two states, either on or off.

The function of the CU within the central processor is to transmit coordinating control signals and commands. The control unit is that part of the computer that directs the sequence of step-by-step operations of the system, selects instructions and data from memory, interprets the program instructions, and controls the flow between main storage and the arithmetic-logical unit.

The ALU, on the other hand, is that part of the computer in which the actual arithmetic operations, namely, addition, subtraction* multiplication, division and exponentiation, called for in the instructions are performed.

Английский язык. Основы компьютерной грамотности 100

Programs and the data on which the CU and the ALU operate, must be in internal memory in order to be processed. Thus, if located in secondary memory devices, such as disks or tapes, programs and data are first loaded into internal memory.

3. Просмотрите текст еще раз. Ответьте на вопросы, ис
пользуя информацию текста.

1. What words in computer science are used interchangeably and why? 2. What components make up the heart of the computer system. 3. What is the function of the CPU? 4. In what way does the CPU control the operation of the whole system? 5. Name the sequence of operations the CPU performs (use five verbs). 6. What are the CPU functional units made of? 7. What is the function of the CU? 8. What operations are performed in the ALU? 9. Where are data processed? 10. Where are data to be processed loaded into?

4. Найдите в тексте английские эквиваленты следующих
словосочетаний:

Хорошо известно; к компьютеру относятся; внутренняя память; составлять суть; выполнять; координировать деятельность; определяя в каком порядке; управлять работой всей системы; при необходимости; в соответствии с командами; уровни памяти; порт ввода-вывода; переключатели; режим включения или выключения; передавать сигналы; указывать последовательность пошаговых операций; основная память; управлять ходом выполнения програм-

101 Unit 8. Central Processing Unit

м

ы; с другой стороны; выполнять вычитание, сложение, возведение в степень, деление, умножение; для того чтобы.

5. Вспомните значение новых слов и попытайтесь перевести словосочетания, употребляемые с этими словами.

Direction: backward direction; clockwise direction; counterclockwise direction; data direction; forward direction; inverse / reverse direction; negative direction; positive direction; printing direction; transmission direction.

Level: access level; application level; data level; device level; difficulty level; error level; function level; hardware level; high level; input level; output level; performance level; presentation level; program level; protection level; resource level; security level; software level; structural level; system level; transmisson level.

Processor: arithmetic processor; central processor; command processor; control processor; data processor; error processor; general-purpose processor; special-purpose processor; image processor; language processor; mail processor; message processor; numeric processor; parallel processor; peripheral processor; text processor.

Switch: to switch between programs; to switch between windows; to switch disks; to switch on; to switch off; to switch over; binary switch; command switch.

Step: conversion step; final step; procedure step; program step; programming step; step by step; one step at a time; to step down; to step out; to step up; to take steps.

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