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

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

1. Primary a) one of the performance characteristics 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 storage performing both sequential and random storage;

5. RAM e) area of memory where protected programs 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 6

CENTRAL PROCESSING UNIT

1. Ознакомьтесь с терминами текста 1.

central processing unit (CPU) — центральный процессор (ЦП)

interchangeably — взаимозаменяемым

образом precisely — точно

internal memory — внутренняя память; внутреннее ЗУ

activity — деятельность; работа; действия операции

to issue — посылать (сигнал); выводить, выдавать (сообщение)

response — ответ; отклик; реакция; отвечать; реагировать

to interprete — интерпретировать; истолковывать;

according to — согласно; в соответствии с

level — уровень; степень; мера; выравнивать

input-output port — порт ввода-вывода

control unit (CU) — устройство управления

arithmetic-logical unit (ALU) — арифметико-логическое устройство

switch — переключатель; коммутатор; переключать; переходить

direct— направлять; адресовать; указывать; прямой; непосредственный

step-by-step operations — пошаговые операции

to select — выбирать; выделять (на экране)

on the other hand — с другой стороны

exponentiation — возведение в степень

call for — требовать; предусматривать

to load — 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.

In digital 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 aetual arithmetic operations, namely, addition, subtraction, multiplication, division and exponentiation, called for in the instructions are performed.

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.