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5. Translate sentences into English using words and word combinations from the Vocabulary Notes.

1) Первинний і вторинний запам’ятовуючі пристрої включають в себе інформацію та інструкції для обробки цієї інформації. 2) Основною функцією первинної пам’яті є утримувати всю оброблювальну інформацію, проміжні і кінцеві результати і команди. 3) Первинна пам’ять – дорога, а вторинна – дешевша. 4) Комп’ютер має два види пам’яті. 5) Основна пам’ять сучасних комп’ютерів складається з інтегрованих схем. 6) Комп’ютерна пам’ять складається з кількох чіпів.

The Grammar in Use Modals

1. Translate the following sentences paying attention to the Modal Verbs and their equivalents.

1) The designer can always improve the operation of these receivers. 2) He could use any transmitter for this system. 3) The scientists are able to construct a new device by using semiconductors. 4) We have to increase the current strength by decreasing the resistance of the current. 5) After finishing the experiment scientists will have to discuss the results. 6) The students didn’t have to analyze these data. 7) We may say that photoelectric properties of transistor are largely used in TV sets. 8) In order to see certain stars we must use a telescope.

2. Put the modal verbs into the:

a) Past Indefinite Tense

b) Future Indefinite Tense

1) Computers can replace people in dull routine work. 2) The program is the set of instructions that may also include data to be processed. 3) Computer-controlled robots must increase the productivity of industry. 4) They can help in making different decisions. 5) The pupils may work with computers at the lessons. 6) Electric pulses can move at the speed of light. 7) Storage devices must have capacities for the input, output data and programs and for intermediate results. 8) Business minicomputers can perform to 100 million operations per second. 9) In order to solve scientific problems researchers must deal with the language of science – mathematics. 10) Programmers must write application programs in a way that computers can understand.

3. Find sentences with modal verbs in the text Additional Text (for individual work)

Read and translate the text.

"Cache" Memories

"Cache" memories are increasingly common ("cache – a hiding place for provisions, treasures etc"). Cache memories are essentially hidden from the applications programmer; the cache belongs to the computer hardware and its controlling operating system. These work together using a cache to increase performance. Currently, a typical cache memory would be up to 256 KB in size. The cache may form a part of the circuitry of the CPU chip itself, or may be a separate chip. Either way, the system will be designed so that information in the cache can be accessed much more quickly than information in main storage.

The OS and CPU hardware arrange to copy blocks of bytes ("pages") from main memory into the cache. The selected pages could be those with the instructions currently being executed. Most programs involve loops where particular sets of instructions are executed repeatedly. If the instructions forming a loop are in the cache, the CPU's instruction-fetch operation is greatly speeded up. Sometimes it is worth copying pages with data from main memory to the cache – then subsequent data accesses are faster (though data that get changed do have to be copied back to main memory eventually). The operations shifting pages, or individual data elements, between cache and memory are entirely the concern of the CPU hardware and the operating system. The only way that a programmer should be able to detect a cache is by noticing increased system's performance.

All data manipulated by computers are represented by bit patterns. A byte, with 8 individual bits, can represent any of 256 different patterns.