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some features of a digital computer . it should be noticed that even in a large-scale digital system, such as in a computer, or in a data-processing, control or digital-communication system, there are only a few basic operations which must be performed. these operations may be operated many times. the four circuits most commonly employed in such systems are known as the or, and, not and flip-flop. they are called logic gates or circuits.
an electronic digital computer is a system which processes and stores very large amount of data and which solves scientific problems of numerical computations of such complexity and with such speed that solution by human calculation is not feasible. so the computer as a system can perform numerical computations and follow instructions with extreme speed but it cannot program itself.
we know that the numbers and the instructions which form the program, the computer is to follow, are stored in an essential part of the computer called the memory. the second im¬portant unit of the computer is the control whose function is to interpret orders. the control must convert the command into an appropriate set of voltages to operate switches and carry out the instructions conveyed by the order. the third basic element of a computer is the arithmetic device, which contains the circuits performing the arithmetic computations: addition, subtraction, etc. the control and arithmetic components are called the central processor. finally a computer requires appropriate input-output devices for inserting numbers and orders into the memory and for reading the final result.
suppose a command to perform an addition or division has been transmitted to the central processor. in response to this order the control must select the correct operands from the memory, transmit them to the arithmetic unit and return to the memory the result of the computation. the memory serves for storing not only the original input data, but also the partial results which will have to be used again as the computation proceeds.
lastly, if the computation doesn't stop with the execution of this instruction and the storage of the partial result, the control unit must automatically pass on to the next instruction. the connection of the control unit back to the input permits insertion of more data when there is room in the memory.
вопросы:
1. what are the most commonly used circuits in any computer? 2. how are they called? 3. what kind of a system is a digital computer? 4. is there anything that a computer cannot do itself? what is it? 5. where are the instructions and digits stored? 6. what is the function of the control? 7. what does the arithmetic device serve for? 8. what components form the central processor? 9. what other devices in addition to the above-mentioned ones does a computer require? 10. how are computations performed in a computer?
Transverse plates dentin in each cheek tooth from 5 to 14 less than the Indian elephant. Ribs 21 pair - more than the Indian elephant. Caudal vertebrae is less than a maximum of 26.
Distributed throughout Africa South of the Sahara. However, almost continuous in the past the area currently broken. The African elephant is not found in most parts of South Africa, Namibia, Botswana, Ethiopia; completely disappeared from Northern Somalia! From Sudan to the West border of the area is now roughly equal to 12° n, however, some isolated areas of habitat remain and to the North (near the lake. Chad, Mali, Mauritania).
Inhabit a variety of landscapes (with the exception of deserts and semi-deserts) from sea level up to 3660 m above the sea level (in exceptional cases even up to 4570 m). Kept herds, which in former times was reached 400 animals. Feeds mainly on branches, stems, bark and roots of trees and shrubs. Reproduction with a particular season is not connected. Pregnancy lasts about 22 months. The female usually gives every 4 years one calf. The newborn weight about 100 kg, the height at the shoulders is about 1 meter Puberty begins at 12-20 years. The lifespan of 60-70 years.