Types of Computers

Computer Desk and Hutch

Computer Desk and Hutch (Photo credit: Scott Beamer)

To categorise computers in terms of size and speed is not simple

because of the fast growing technology associated with computer
engineering. However, computers are usually classified are follows:
(a) Mainframe Computers
This category of computers specially housed in big buildings are very large and majorly owned by large organisations in the past decades. Since today’s technology has led to the reduction in size and cost of computers, mainframes have virtually become, especially in Nigeria, machines traceable to Museums.
(b) MinicomputersThese are computers next down from mainframes. From the perspective of mainframes, they can be properly called medium-sized computers but can perform many of the tasks that mainframes can on a reduced scale.
(c) Microcomputers or Personal Computers (PC)
The name microcomputer is coined from the fact that it is designed using the microprocessor. They are also called Personal Computers
(PC’s) because that are typically designed for single users unlike mainframes and minicomputers that often serve more than one user at atime. Most computers found around today are micros or PC’s. To further categorise PC’s, you have possibly heard of the following:

(i) Desktop Computers
These are the PC’s designed to stay in one place, usually on desks or tables. However, you should have seen some types of computer
cases being put on the floor, especially the tower style cases.

( i i ) Notebook or Laptop Computers
These are portable computers about the size of a notebook and can be placed on your lap while travelling in a bus. Laptop
computers are usually powered by rechargeable batteries and due to their great merit of being smaller in size, they are usually
expensive. Moreover, it is more expensive to produce Liquid Crystal Display (LCD) used by laptops than the conventional
monitor used by desktops.
( i i i ) Palmtop Computers
These are the latest and smallest computers available in the market now. As their name implies, you can place them on your palm.

Article source:  National Open University of Nigeria

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