What is Computer?
What is Computer : Computer is
an electronic device that is designed to work with Information. The term computer is derived from the Latin term ‘computer’, this means to calculate or programmable machine. Computer can not do anything without a Program. It represents the
decimal numbers through a string of binary digits. The Word
'Computer' usually refers to the Center Processor Unit plus Internal memory.
Charles Babbage is called the "Grand Father" of the computer.
The First mechanical computer designed by Charles Babbage was called Analytical
Engine. It uses read-only memory in the form of punch
cards.
Computer is an advanced electronic device that takes raw data as
input from the user and processes these data under the control of set of
instructions (called program) and gives the result (output) and saves output
for the future use. It can process both numerical and non-numerical (arithmetic
and logical) calculations.
Digital Computer Definition
The basic components of a modern digital
computer are: Input Device, Output Device, Central Processor Unit (CPU),
mass storage device and memory. A Typical modern computer uses LSI Chips.
Four Functions about computer are:
accepts data
|
Input
|
processes data
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Processing
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produces output
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Output
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stores results
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Storage
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Input (Data):
Input is the raw information entered into a computer
from the input devices. It is the collection of letters, numbers, images
etc.
Process:
Process is the operation of data as per given instruction. It is
totally internal process of the computer system.
Output:
Output is the processed data given by computer after data
processing. Output is also called as Result. We can save these results in the storage
devices for the future use.
Computer Classification: By Size and
Power
Computers differ based on their data processing abilities. They
are classified according to purpose, data handling and functionality.
According to functionality, computers are classified as:
• Analog Computer: A computer that represents numbers by some continuously variable
physical quantity, whose variations mimic the properties of some system being
modeled.
• Personal computer: A personal computer is a computer small and low cost. The term"personal
computer" is used to describe desktop
computers (desktops).
• Workstation: A terminal or desktop computer in a network. In this context,
workstation is just a generic term for a user's machine (client machine) in
contrast to a "server" or "mainframe."
• Minicomputer: A minicomputer isn't very mini.
At least, not in the way most of us think of mini. You know how big your
personal computer is and its related family.
• Mainframe: It refers to
the kind of large computer that runs an entire corporation.
• Supercomputer: It is the biggest, fastest, and most
expensive computers on earth.
• Microcomputer: Your personal computer is a microcomputer.