2.4. Match each piece of hardware on the left with its function on the right.
1. Storage device
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a. displays the processed data.
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2. Input device
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b. holds the programs and data being used by the processor.
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3. Output device
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c. does all the processing and controls
the peripherals.
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4. Main memory
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d. allows data to be entered.
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5. Processor
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f. provides permanent storage for programs and data.
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2.5. Fill in the gaps using the words from the box.
keyboard input unit requirements graphics the CPU
arithmetic control input calculation
_______ devices are used to supply the values needed by the computer and instructions to tell the computer how to operate on the value. _______ vary greatly from machine to machine.
Information is usually entered into a computer via a _______, with the characters typed on the screen. In English speaking countries the keyboard would have the QWERTY(1) layout. Many computers provide graphics commands which can be used to build up pictures. _______ are very important for the interface between the human user and the computer.
The arithmetic unit of a digital computer performs the actual work of computation and calculation. It carries out its job by the use of logic circuits. Modern computers use components called integrated circuits.
The control unit of a digital computer is an administrative or switching section. It receives information entering the machine and decides how and when to perform operations. It tells the arithmetic unit what to do, where to get the necessary information. It knows when the arithmetic unit has completed a ______, and it tells the arithmetic unit what to do with the results and what to do next.
The _______ unit and the ______ unit are usually grouped together in a computer and are the central processing unit or CPU. The ______ gets instructions from the memory and carries out the operations required. On microcomputers this is done by a single silicon chip called a microprocessor.
(1) QWERTY стандартная для англоязычных стран клавиатура (первый ряд букв на которой начинается последовательностью QWERTY)
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