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