It is the large-sized computer which is used for the basic business system and the like of enterprise.
The computer which from around 1950 age starts being used with commercial business at the beginning has divided for business processings and into one for the technology calculation, including also the respective programming language, and the like there was no compatibility.
IBM announced the computer, "system /360", in 1964 in such circumstance, changed history. Because as for this it can utilize in multi uses such as business calculation, technical calculation and rial-time processing, the computer which is decended this is called the "general-purpose machine". Furthermore, the personal computer (PC) and the work station where spread starts in the eighties "general purpose" is, but the especially general-purpose machine you do not say. As a large-sized computer there is a super computer, but because this has specialized in calculation ability, the general-purpose machine you do not say.
If you call to the sixties the computer, being to be the large-sized machine, there was no name "of computer" or more, but as after that the small-sized computer appears, the alias, "mainframe" was born.
The substance of the mainframe with the enormous device, usually has been stored to the private computer room. Through the communications network to this, the terminal is connected, the user operates from here. The terminal has not loaded the processor and the storage unit etc. and it is the mere input-output unit. However, it is not the special-purpose terminal from around 1990, it emulates the terminal at PC and the work station there is many also a thing which is used. As for the system of the mainframe, the point where it becomes architecture of the central centralized type that processes the data and retains entirely the substance, is one feature.
Recently, with the efficiency improvement of the PC server and the UNIX server, as processing efficiency potential of the hardware always the high performance it has become unable to say, but most parts such as power source and CPU and storage unit are multiplexed, from the fact that it is superior in anti- obstacle efficiency, the mass transaction like the online system of the bank with the use where it is necessary to execute in high speed and safety, as for needs of the user are deep-rooted.
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