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What is a Computer?

What is a Computer?.

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What is a Computer?

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  1. What is a Computer? A computer is a machine with a complicated network of electronic circuits using very high integration. It is capable of storing millions of data and performing up to billions of operations in one second, from the simplest comparison between two numbers to the most complicated and powerful string manipulation. This work is performed at incredible speed, following technological improvements. In only a short time, the computer has changed the way in which many kinds of jobs are done. However, it is not able to think. It accepts data and instructions as input, and after processing them, it outputs the results. A computer is not merely a machine but a system. So in a Data Processing Center (DPC.) we have to consider three parts: the hardware or central processor and peripheral equipment, the software or programs and the liveware or the technical people, including the staff. The hardware consists of several units: the central processor, the input/output processors (I/O), data communication processors (DCOM), all of them with one or several units and many combinations. Attached to the I/O processors is the peripheral equipment; attached to the DCOM are the teleprocessing lines, adapters, modems and terminals, or another computer alone or networking with another host system. The software is the collection of man-written solutions and specific instructions needed to solve problems with a computer, as well as all documents needed to guide the operation of a computer, that is, manuals, programs, flowcharts, etc. The liveware basically consists of system analysts, the programmers, operators and technical managers, including supervisors, networking and data base administrators. (Ingles para processamento de dados. Galante, T.P., Pow, E.7ºed. SP : Atlas, 1996.)

  2. Referência contextual • A referência contextual também representa um recurso auxiliar na compreensão das idéias de um texto. As chamadas palavras de referência substituem palavras que estão no texto (ou fora dele) e podem classificar-se da seguinte maneira: • Pronomes (pessoais, possessivos, demonstrativos, relativos e indefinidos); • Numerais ordinais; • Palavras que indicam ordem e exemplificação;

  3. What is a Computer? 1 A computer is a machine with a complicated network of electronic circuits using very high integration. It is capable of storing millions of data and performing up to billions of operations in one second, from the simplest comparison between two numbers to the most complicated and powerful string manipulation. This work is performed at incredible speed, following technological improvements. In only a short time, the computer has changed the way in which many kinds of jobs are done. However, it is not able to think. It accepts data and instructions as input, and after processing them, it outputs the results. 9 A computer is not merely a machine but a system. So in a Data Processing Center (DPC.) we have to consider three parts: the hardware or central processor and peripheral equipment, the software or programs and the liveware or the technical people, including the staff. The hardware consists of several units: the central processor, the input/output processors (I/O), data communication processors (DCOM), all of them with one or several units and many combinations. Attached to the I/O processors is the peripheral equipment; attached to the DCOM are the teleprocessing lines, adapters, modems and terminals, or another computer alone or networking with another host system. The software is the collection of man-written solutions and specific instructions needed to solve problems with a computer, as well as all documents needed to guide the operation of a computer, that is, manuals, programs, flowcharts, etc. • The liveware basically consists of system analysts, the programmers, operators and technical managers, including supervisors, networking and data base administrators.

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