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Hard (Fixed) Disk: Hard disk are the main, large
Data storage within your computer hard disk are used
To store your operating system, your application
Programs.Thay are much faster than CD-ROMs
And floppy disks and can also hold much more data.




Sound cards and speakers

Modems:A modems is a device that is used to attach
Your computer to the telephone system.


Printers:





Scanners.


Recordable CDs.

Tape backup:A tape backup unit allows for regular
Backing up of your data.These tapes can store a vast
Amount of data at low cost.



What are input devices? Input devices allows you to
Input information to the computer and include things
Such as the mouse.



What are output devices? Printer monitor.


The CPU (central processing unit): The CPU is the
Brains within your computer.(RAM-Random Access
Memory)


The Mouse.

The Keyboard

Tracker Balls: is an alternative to the traditional
Mouse and favored by graphic designers.









Scanners ; allows you to scan printed material and convert it into a file format that may be used within the PC.you can scan pictures and then manipulate








Touch pads: is a device that lays on the desktop and
Responds to pressure.






Light pens: light pen is used to allow users to point to areas on a screen and is often used to select menu choices

Joysticks: Many games require a joystick for the proper
Playing of the game.




Wed cams: mounted on the PC montor to allow two- way
Communication involving not just text communication
But sound and video Communication as well.






































Digital cameras: the images are stored digitally in memory housed within the camera.






The VDU computer or screen: visual display unit is the computer screen used for outputting information in an
Understandable format for humanns.














Flat screen monitors>


Screen size>

What is VGA Super VGA and XGA ? VGA(video graphics array ) XGA(or XGA compatible)









































Graophics for games

Computer presentation projection devices.


Different types of printer



Laser printers


Color laser printers



Inkjet printers


Dot matrix printers



Printer memory.



Cost of printer peripherals.



Plotters:








Speakers]






Internal hard disks>
Capacity: often in excess of 10 gigabytes.A gigabyte is **********alent to 1024 megabytes.




External hard disks: Speed: Normally slower that internal disks


Cost: More expensive than internal disks.


Zip drives[

Diskettes (floppy disks): Speed: very slow!

Capacity: Normally 1.44 Mbytes.

Cost: very cheap

CD-ROM Disks: Speed: Much siowes than hard disks.


Capacity:Around 650 Mbytes.

DVD Drives: Speed: Much faster than CD-ROM drives but not as fast as hard disks.


Capacity: up to 17 Gbytes.

What is the difference between internal and extenal haed disks?

Internal hard disks are located inside your main computer
Unit, while external hard disks are joined to the main computer unit.Other extenal haed disks require the installation of a special card within your computer that
Allows the connection of the extenal haed disks to the
computer unit.
















What is RAM?
Random Access Memory (RAM) is the main working memory used by the computer.Commonly modern computers are supplied with over 64 MB of RAM.
























What is ROM?
Read Only Memory




What is the ROM-BIOS?
The Read Only Memory Basic Input Output System.