Monday, January 31, 2011

The System Unit

FLASH MEMORY
A flash memory can be deleted from the compter system. Many handheld devices such as handphones, PDA etc use flash memory chips too save data

GRAPHIC CARD
A graphic card is a device which has a graphic processing unit that is design to show and make images, even in 3D graphic. The graphic card hep take the strain off the main processor and have their own memory to take the strain offf the RAM

SOUND CARDS
Sound cards is one of the most improtant cards and yet we still can use computer with out it. Sound cards enable the computer to output sound through speaker

NETWORK INTERFACE CARD. (NIC)
NIC which is short for Network Interface Card is a card in the system unit which allows network connection in the system unit.

PLUG AND PLAY
Plug & Play also known as PnP, is a phrase use to describe that work with computer system when they are connected to something


BUS LINE
The bus lines are the communication electronic lines. this means it connect different parts of the cpu to other parts

SECONDARY STORAGE

FILE COMPRESSION.
Files compressiong means saving the space of storage by compressing the data all together. A file compression can make a big file small so that it can be send to the internet faster

HEAD CRASH
A head crash means that, damages happen in the hard disk drive. This happen because the head od hard disc touch the magnetic surface and head crash happens

INTERNET HARD DRIVE
Internet hard drive is a memory located in the internet that can be used anywhere with out carrying anything. It is very cheap however some times it is slow

OPTICAL DISC DRIVE.
This is a normal disk which is also a secondary storage because it can save lot of things inside. It stores digital data such as video and it is use to read with a laser by scanning the disk. It is the most cheapest secondary storage device

SOLID-STATE STORAGE.     
Solid-State Storage is basicly things like memory card, memory stick etc. It stores data more faster. It is made up by things like transistor and chips and it is more expensive then anyother secondary storge device

Friday, January 28, 2011

INPUT AND OUTPUT

ERGONOMIC KEYBOARD
Ergonomic Keyboard is just like a normal keyboard except it is more confortable for users to type and it is also more expensive. Usually all those heavy writters buy this type of keyboard


INK-JET PRINTER
This printer sprays drops of colour to many sizes of paper. It can spray black and white and can also spray coloued text and images such as photos

LASER PRINTER
A laser printer is  very fast printer with a quality non impact printer. It can also print either text of pictures in both colored and black and white. A laser printer is more costly then a regular printer like ink jet printer.


OPTICAL-CHARACTER RECOGNITION.  
OCR also known as optical-character recognition is a input device which can read printed notes or any typewritten documents and  converts them into a way which the computer can understand. It works like a scanner
                                         
OPTICAL MARK RECOGNITION.
Optical Mark Recognition which can also be called as OMR is an imput device which can even read hand-drawn shapes such as rectangular triangle and even a square. It is mostly use to mark exam MCQ questions. This works by detectung the correct answer via the light and dark                   

BASIC APPLICATION SOFTWARE

GRAPHICAL USER INTERFACE.
Graphical user interface is very important to show the pictures of any input or output tools in the computer. For example, the icon, buttons and some software in a computer.There are many application these days  uses graphical use interface card to represent theire program
WORD PROCESSORS.
A word processor is a tool which use efficent for text based documents such as letters memos faxes etc

SPREADSHEET
A spreadsheet is an application tool which is commonly used in business to coat budgets and financial report. Microsoft excel is the most popular spreadsheet program however there are progras like coral quattro and lotus 1-2-3 etc

DATABASE MANAGEMENT SYSTEM.
A database management system is used to create a database

UTILITY SUITE
Utility suite is a application program which makes the computing safer to use