Select the correct laptop for you

There are several types of laptops but when selecting a laptop you should select the correct laptop for your needs

Student
If you are a student you always try to buy a notebook computer as it is low in price and easy to carry. As a student you have to take it from one glass to another,
13 inch thin and light laptop

But students should consider to buy - at least 1GB RAM
160 GB Hard drive
13 inch screen

The business Traveler
Should look for 2 GB - 4 GB RAM
160 or larger HDD
12-15 inch screen
Mobile Broadband modem
Lenovo's Thik pad and Dell's latitude are suitable

The photographer and or Videographer
4 GB to 8 GB RAM
320 GB HDD
17 inch or large display

The home user
2 GB to 4GB RAM
250 GB or larger HDD
14- 16 inch screen

HOW TO INSTALL RAM

* RAM s usually comes like 16 32 128 256 512 1024 MB

* If you need to have 1 GB RAM u can add 1024 MB RAM

* If you alrady using a 512 MB Ram u can easilly put another 512 MB RAM

then it works as 512 MB RAM ( 512MB + 512MB = 1024 MB = 1.024 GB)

* After knowing How much RAM you need You must see what is the card type (RAM type )

ypu need

* you can find this in the manual of your computer

* today most computers usually have DIMM slots.

* KEEP REMEMBER PUTTING WRONG TYPE OF RAM CAN BE DAMAGE BOTH SYSTEM AND THE CARD

* This RAM type must match the existing RAM in speed, parity and type

* common type available today is SDRAM.

* Before open the case of your CPU make sure that computer is turnoff and unpluged

* RAM is installed in a series of slots on the motherboard known as the memory bank.

* Select the correct slot and install the RAM

RAM and SAM

RAM

You can access memory cell directy

if you know the row and colum of that cell correctly.

Opposite of RAM is SAM (Serial access memory)

This is usually used to store memory in order

(eg :texture buffer memory on a video card)

RAM data can be access in any order as you wish.

Networking

networking is the practice of linking two or more computing devices together
3 main networking methods
Local Area Network (LAN)
metropolitan area network (MAN)
Wide Area Net work (WAN)

External modem

Internal modem

Modem

This allows your computer with other computers over an ordinary phone line
There are two kinds of modem,
internal - Add in an card into a free ISA slot in the motherboard
external - attaches via a cable to your computer
You can attaches external modem using USB port.
Internal modems are cheap
External modems are easier to troubleshoot and reset

BIOS Chip

BIOS Chip
Short of basic input/output system
Located in every computer motherboard
This contains instruction like
• How system should boot
• How it opperates

Hard disk

A magnetic disk on which you can store computer data.

Motherbord

The most essential component in a personal computer
This contains the computer's micro-processing chip and everything attached to it is vital to making the computer run.

RAM

random access memory
a type of computer memory that can be accessed randomly
There are two different types of RAM
DRAM (Dynamic Random Access Memory)
SRAM (Static Random Access Memory).
DRAM - common type
SRAM - faster

Processor

A processor is the logic circuitry that responds to and processes the basic instructions that drive a computer.
The processor in a personal computer is called a microprocessor.
There are two primary manufacturers of computer microprocessors. Intel and Advanced Micro Devices (AMD) lead the market in terms of speed and quality.

Power Supply Unit.

Power Supply Unit.
This component supplies power to other component in a computer.
Power supply unit converts alternating current (AC) to Direct current (DC)
Power supplies have a switch to change between 230 V and 115 V.
Some models have automatic sensors which switch voltage automatically.
Or accept any voltage between it’s limit.

Connecting Peripherals

Connecting Peripherals

PS/2 port is use to connect mouse or keyboard.
Green color port always use to connect the Mouse
Ps/2 port which use to connect keyboard can be black or purple in color.
VGA port – (Video Graphic Array) to connect the monitor
Serial port - To connect modems serial mouse etc.
Parallel port – to connect printers and scanners.
LAN port- Use to connect computer to Local Area Network.
Audio ports – Green color port always use to connect speakers.
Other ports use to connect microphone etc.
USB ports – Use to connect pen drive USB mouse Keyboard etc.

Parts of a Computer

WHAT IS A COMPUTER

A machine for performing calculations automatically.
It is a machine that manipulates data according to a set of instruction.
First electronic computer developed in 1940-1945.These computers were a size of a large room.