What is Computer :
Computer is an electronic device that is designed
to work with Information. The term computer is derived from the Latin term ‘computare’,
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
|
Processing
|
produces
output
|
Output
|
stores
results
|
Storage
|
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.
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