Мои Конспекты
Главная | Обратная связь


Автомобили
Астрономия
Биология
География
Дом и сад
Другие языки
Другое
Информатика
История
Культура
Литература
Логика
Математика
Медицина
Металлургия
Механика
Образование
Охрана труда
Педагогика
Политика
Право
Психология
Религия
Риторика
Социология
Спорт
Строительство
Технология
Туризм
Физика
Философия
Финансы
Химия
Черчение
Экология
Экономика
Электроника

Mainframes




make up the bulk of the machine in a powerful installation. The power 35
consumption of these machines is also quite high, not to mention the
price that runs into hundreds of thousands of dollars. The future will
bring great developments in the mechanical devices associated with
computer systems. For a long time these have been the weak link, from
the point of view of both efficiency and reliability. 40


 


[1] Large computer systems, or mainframes,as they are referred to in the 1
field of computer science, are those computer systems found in
computer installationsprocessing immense amounts of data. These
powerful computers make use of very high-speed main memories into
which data and programs to be dealt with are transferred for rapid 5

access. These powerful machines have a larger repertoire of more
complex instructions which can be executed more quickly. Whereas
smaller computers may take several steps to perform a particular
operation, a larger machine may accomplish the same thing with one
instruction. 10

[21 These computers can be of two types: digitalor analog.The digital
computer or general-purpose computer as it is often known, makes up
about 90 per cent of the large computers now in use. It gets its name
because the data that are presented to it are made up of a code
consisting of digits- single-character numbers. The digital computer is 15
like a gigantic cash register in that it can do calculations in steps, one
after another at tremendous speed and with great accuracy. Digital
computer programmingis by far the most commonly used in electronic
data processingfor business or statistical purposes. The analog
computer works something like a car speedometer, in that it 20

continuously works out calculations. It is used essentially for problems
involving measurements. It can simulate, or imitate different
measurements by electronic means. Both of these computer types - the
digital and the analog - are made up of electronic components that may
require a large room to accommodate them. At present, the digital 25

computer is capable of doing anything the analog once did. Moreover, it is easier to program and cheaper to operate. A new type of scientific computer system called the hybrid computerhas now been produced that combines the two types into one.

13]Really powerful computers continue to be bulky and require special 30

provision for their housing, refrigeration systems, air filtration and power supplies. This is because much more space is taken up by the input/output devices - the magnetic tape and disk units and other peripheral equipment - than by the electronic components that do not





Поиск по сайту:







©2015-2020 mykonspekts.ru Все права принадлежат авторам размещенных материалов.