Until the mid-1960s, digital comput

Until the mid-1960s, digital computers were powerful, physically large and expensive. What was really needed though, were computers of less power, a smaller memory capacity and without such a large array of peripheral equipment. This need was partially satisfied by the rapid improvement in performance of the semi-conductor devices (transistors), and their incredible reduction in size, cost and power; all of which led to the development of the minicomputer or mini for short. Although there is no exact definition of a minicomputer, it is generally understood to refer to a computer whose mainframe is physically small, has a fixed word length between 8 and 32 bits and costs less than U.S. $100,000 for the central processor. The amount of primary storage available optionally in minicomputer systems ranges from 32–512K* bytes; however, some systems allow this memory to be expanded even further.

A large number of peripherals have been developed especially for use in systems built around minicomputers; they are sometimes referred to as miniperipherals. These include magnetic tape cartridges and cassettes, small disk units and a large variety of printers and consoles.

Many minicomputers are used merely for a fixed application and run only a single program. This is changed only when necessary either to correct errors or when a change in the design of the system is introduced. Since the operating environment for most minis is far less varied and complex than large mainframes, it goes without saying that the software and peripheral requirements differ greatly from those of a computer which runs several hundred ever-changing jobs a day. The operating systems of minis also usually provide system access to either a single user or to a limited number of users at a time.

Since many minis are employed in real-time processing, they are usually provided with operating systems that are specialized for this purpose. For example, most minis have an interrupt feature which allows a program to be interrupted when they receive a special signal indicating that any one of a number of external events, to which they are preprogrammed to respond, has occured. When the interrupt occurs, the computer stores enough information about the job in process to resume operation after it has responded to the interruption. Because minicomputer systems have been used so often in real-time applications, other aspects of their design have changed; that is, they usually possess the hardware capability to be connected directly to a large variety of measurement instruments, to analog and digital converters, to microprocessors, and ultimately, to an even larger mainframe in order to analyse the collected data.

Результаты (русский) 3:

До середины 1960-х годов, цифровые компьютеры были мощные, физически крупных и дорогостоящих. Что действительно необходимо хотя, были компьютеров меньше мощности, меньший объем памяти и без такой широкий спектр периферийного оборудования. Необходимость в этом была частично удовлетворена быстрого улучшения в производительности полупроводникового устройства (транзисторов), и их невероятной сокращение размера,И; все это привело к разработке Миникомпьютер или мини-на короткое замыкание. Несмотря на то, что в отеле нет точное определение Миникомпьютер, как правило, понимаются см. ЭБУ, основной раме физически малым, фиксированная длина слова между 8 и 32 бита и расходов меньше, чем в США 100 000 долл. США для центрального процессора.Объем первичной системы хранения можно приобрести дополнительно в Миникомпьютер систем варьируется от 32-512K * байт; вместе с тем, некоторые системы позволяют этой памяти могут быть расширены.ветровому большое количество периферийных устройств были разработаны специально для использования в системах вокруг после Вьетнамской войны; они иногда называют miniperipherals. Они включают в себя магнитной ленты картриджи и кассеты,