Chapter 1.4

Network

File server is a microcomputer that is used to store programs and data so that everyone can share them.

Network- it is when several computers are connected together with cables.

Advantages of a networks are

• From a single PC, the teacher can monitor the work of any student in the class.

• There is no need to load into each PC. One single copy of a program residing on the file server can be used by all the pupils.

• There is no need to supply a printer for each PC on the network. Student can print from the network printer.

Personal Safety Rules in the computer laboratory

1. Obtain teacher's permission before performing any activity in the laboratory.

2. Report fire or accidents to your teacher immediately.

3. Report to your teacher if you notice any broken plug or cables.

4. Sit in front of your computer in the right posture.

5. Avoid stepping on any wires or cables.

6.Do not run or 7. play or 8. eat or 9. drink in the laboratory.

10. Do not open the system unit casing or monitor casing especially when the power is ON.

11. Do not insert any metal objects into the computer casings. It may cause fire.

12. Do not touch, connect or disconnect any cable without teacher's permission.

Guidelines on the care of computer equipment

1. Do not operate your PC during heavy rain and lightning.
2. Do not switch ON/OFF too rapidly. (Wait at least 2 minutes)
3. Do not touch any internal parts of the computer.
4. Avoid exposing the PC to excessive dust by covering the PC with dust covers.
5. Avoid exchanging floppy disks with your friends.
6. Scan your disk floppy disks with your friends.
7. Turn on the power to your printer, system unit and monitor in this order.
8. Turn off the power in the reserve order.

VIRUS

A virus is a tiny program intentionally created to destroy data or program.

Computer virus can be dangerous as they can cause loss of data or even cripple the system unit.

Example : Melissa virus, I Love You virus, Ping Pong Virus and etc.

Five ways to minimise virus infection :

1. Do not copy software or data from unknown sources.

2. Consult your teacher or your parents before using any new software.

3. Use virus detection programs to find out whether your disk if free from virus or not.

4. Avoid sharing your data files and software with someone else.

5. Do not download software from the Internet. It may be infected with viruses.

1.2 & 1.3 The Computer System (Electronic system)

System is a group of components designed for a particular job.

It consists of 4 components :

1. System unit ; 2. Keyboard; 3. Monitor & 4. Printer.

1. System Unit divided into two parts: 1.Motherboard 2.Storage device.

2. Keyboard for entering data into the computer.

3. Monitor - displays data in the form of rows & columns.

• Soft copy - The data displayed in a screen

4. Printer It gives printed output on paper.

• Hard copy - The printed output

HARDWARE is a computer equipment.

Cheap. Can see. Can touch when you look at a computer.

E.g. printer, keyboard, monitor, mouse, scanner, plotter and etc.

SOFTWARE is a computer program.

Costly. Can see once it is printed. Can not touch.

E.g. Microsoft Word, Microsoft Excel, Print Master and etc.

1.3. Computer System Electrical Connections

Booting - starting the system.

Normal procedure:

1) Switch on all the peripherals;

2) The system unit;

3) The monitor.

Revision Part 1 ( For PMB candidates)

Chapter 1.1

PC - Personal Computer

A COMPUTER is basically a processor of information.

1. INPUT involves obtaining the data. E.g. keyboards, mouse, light pen and etc.

DATA is facts and figures or input to a computer.

2. PROCESSING involves manipulation (means adding,

subtracting, multiplying, comparing) of the data.

• The processor is the brain of the computer.

3. OUTPUT involves sending the results of the processing, the information to users.

It is also known as information, which is the summarised data. E.g. printers, monitor and etc.

• INFORMATION is the results of processing or summary of data.

4. STORAGE used to store data for later retrieval, updating and referencing. E.g. Floppy disk and hard disk.

The characteristics of a computer :

1. It is an automatic machine.
2. It processes data quickly and accurately.
3. It has no feelings or emotions like human beings.
4. It can recall any stored information when needed.
5. It cannot think on its own, but follows instructions.
6. It has a storage capacity for storing data and instruction.

5. A PROGRAM is a set of instruction to complete a job.

6. Sorting - Arranging data in a particular order. Eg. A-->Z or Z --> A

Important dates

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