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.
History of Computer?
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
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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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What is Input?
Input is the raw information entered into a computer from the input devices. It is the collection of letters, numbers, images etc.
What is Process?
Process is the operation of data as per given instruction. It is totally internal process of the computer system.
What is 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.
Brief Computer Classification?
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.
What is CPU (Central Processing unit) ?
In
terms of computing power, the CPU is the most important element of a
computer system. It add and compare its data in cpu chip. A CPU or Processors of all computers, whether micro, mini or mainframe must have three element or parts primary storage, arithmetic logic unit (ALU), and control unit. Control Unit (CU) - decodes the program
instruction. CPU chip used in a computer is partially made out of
Silica. on other words silicon chip used for data processing are called
Micro Processor.
Central
processing unit (CPU) is the central component of the Pc. Sometimes it
is called as processor. It is the brain that runs the show inside the
Pc. All work that is done on a computer is performed directly or
indirectly by the processor.