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       #Post#: 95--------------------------------------------------
       What Is A Compauter
       By: kingrollex Date: September 18, 2015, 5:30 pm
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       Computer generally means a programmable machine.
       The two principal characteristics of a computer are:
       it responds to a specific set of instructions in a
       well-defined manner and it can execute a prerecorded
       list of instructions (a program).
       Modern Computers Defined:
       Modern computers are electronic and digital. The
       actual machinery — wires, transistors, and circuits —
       is called hardware; the instructions and data are
       called software.
       All general-purpose computers require the following
       hardware components:
       Memory: enables a computer to store , at least
       temporarily, data and programs.
       Mass storage device: allows a computer to
       permanently retain large amounts of data. Common
       mass storage devices include disk drives and tape
       drives.
       Input device: usually a keyboard and mouse, the
       input device is the conduit through which data
       and instructions enter a computer.
       Output device: a display screen, printer, or other
       device that lets you see what the computer has
       accomplished.
       Central processing unit (CPU): the heart of the
       computer, this is the component that actually
       executes instructions.
       In addition to these components, many others make
       it possible for the basic components to work
       together efficiently. For example, every computer
       requires a bus that transmits data from one part of
       the computer to another.
       Computer Classification: By Size and
       Power
       Computers can be generally classified by size and
       power as follows, though there is considerable
       overlap
       Personal computer: a small, single- user computer
       based on a microprocessor. In addition to the
       microprocessor, a personal computer has a
       keyboard for entering data, a monitor for
       displaying information, and a storage device for
       saving data.
       Workstation: a powerful, single-user computer. A
       workstation is like a personal computer, but it
       has a more powerful microprocessor and a higher-
       quality monitor.
       Minicomputer: a multi-user computer capable of
       supporting from 10 to hundreds of users
       simultaneously.
       Mainframe: a powerful multi-user computer
       capable of supporting many hundreds or
       thousands of users simultaneously.
       Supercomputer: an extremely fast computer that
       can perform hundreds of millions of instructions
       per second.
       The First Computer:
       The first computer, the ENIAC machine (John W.
       Mauchly and J. Presper Eckert at the University of
       Pennsylvania) used 18,000 vacuum tubes and
       trequired 167 square meters (1800 square feet) of
       floor space ( source ).
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