1 basic cptr concepts
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BASICCOMPUTER
CONCEPTS
Course: Introduction to Computers
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What Is A Computer?
A computer is an electronic device,oper ating under the control of instructions (software) stored in its ownmemory unit, that can accept data
(input), manipulate data (process), andproduce information (output) from the
processing. Gener ally, t
he term is usedto describe a collection of devices that
function together as a system.
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Major Components of a Computer
A computer system consists of two main parts: hardware
and software.
Hardware is the electronic and mechanical parts of a
computer system.
Soft ware is the data and the computer progr ams of a
computer system.
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Hardware vs. Software
Hardware
The computer equipment
Includes printers, monitors, disk drives, etc.
Software
Progr ams which tell the computer what to do
Examples - word processing, gr ade book,
tutorials, games, etc.
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Computer Oper ations
Input Processing Output
Stor age
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Input-Process-Output Model (IPO)
Input: keyboard, mouse, scanner, punch cards
Processing: CPU executes the computer progr am Output: monitor, printer, f ax machine
Stor age: hard drive, optical media, diskettes, magnetic tape
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What Are The Primary Components Of A
Computer ?
Input devices.
Centr al Processing
Unit (containing
the control unit andthe arithmetic/logic
unit).
Memory.
Output devices. Stor age devices.
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Input DevicesComputers accept information from the
outside world.
The keyboard is the most common inputdevice.
Pointing devices like the mouse also
receive input.
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Process Information
The processor, or central processing unit
(CPU), processes information, and
performs all the necessary arithmetic
calculations. The CPU is like the ³br ain´ of
the computer.
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Output Devices
Computers produce information and send it
to the outside world.
A video monitor is a common outputdevice.
Printers also produce output.
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Store Information
Memory and stor age devices are used to
store information.
Primary storage is the computer¶s mainmemory.
Secondary storage uses disks or other
media.
Primary stor age Secondary stor age
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Buses, Ports, and Peripher als
Information tr avels
between components
through groups of
wires called buses.
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Buses, Ports, and Peripher als
Peripher als:
are external devices for receiving input or
producing output (keyboard, monitor, andmouse).
communicate with other parts of the system.
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Buses, Ports,and Perip
her
als
Provide attachment and
communication with
external devices bymeans of:
Slots:-
(for internal attachment)
Ports:-(for external attachments)
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Benefits of Using Computers
Error-free calculations
Speed Flexibility
Stor age
Consistency and repetition
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How Computer present the data
Most computers are digital. They
recognize only two discrete
states; on and off.
Computers are electronic devices
powered by electricity,ha
vingonly two states; on and off.
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Data Representation
The digit 0 represent theelectronic state on and digit 1
represent the electronic state off .This is called binary data
representation
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Binary system
It is a number system that has just
two unique digits,0 and 1,called bits.
Binary Conversion