Classification of Computers

Computers can be divided into the following categories:

1. Micro Computers

Microcomputer is also called Personal computers. It was introduse in 1970. It is designed to be used by on person at a time. It consists of one or more input device, output device, storage device, memory and processor. It generally consists of single processor. Some PC's may have two processors. Most commonly used personal computers are PC and Apple Macintosh. Major types of personal computer are desktop computers and portable computer

i. Desktop Computers

                                                                                          Desktop computers are the most common type of personal computer.It is designed in a way that all its components fit on a desk or table. In one model,the system unit is placed  horizontally on the desktop or table and monitor is placed on the system unit.In another model, called tower model, both monitor and system unit are placed on the table.The system    unit in tower model is placed vertically.

ii. Portable Computer

Portable is a personal computer that can be carried from one place to other easily.
 Following are two main types of portable computers:

a. Notebook Computers

Notebook Computer is also called laptop computer. It is small in size and can be placed easily on lap. Only one user can use them at a time. It use less power. It can be used using batteries. A laptop computer can perform the same basic functions as a personal computer. Laptop computers are more expensive than desktop computers.

b. Handheld computers

Handheld computer is also known as palmtop computer. It easily fit in the hand of the user. It contains small screen and small keyboard. Handheld often use stylus to enter data. Some handheld computers also support voice input. Handheld computer is not powerful as compare to desktop and notebook computer. Some examples of handheld computers are Personal Digital Assistant (PDA and Web-enabled Cellular Telephone.