JSS 2 WEEK FOUR LESSON NOTE

Jss2

TOPIC: CLASIFICATION OF COMPUTERS BY SIZE AND PURPOSE

Introduction

Computer can be classified by the physical size, memory size and processing speed. Various categories of computers have overlapping properties hence it may be difficult to have absolute distinction between these categories. Digital computers can be categories thus:

        I.            Mini computers

     II.            Micro computers

   III.            Mainframe computers

Mini computer

These set of computers were initially designed for scientific and special purpose but the usage has been extended to the business markets. These computers have the ability to perform many tasks at the same time. i.e. simultaneously. Examples are PDP II, VAX 6000, HEWLETT PACKARD 3000 etc.

Micro computers

Micro computers are the smallest and rugged general-purpose computers and most popular. It is single task oriented unlike the mini-computer that is many tasks oriented. It is very easy to operate and maintain. Examples are Apple Macintosh, IBM PC. Micro computers are of different shapes i.e. desktop, laptop etc.

Mainframe computer

Mainframe computers are large in terms of size of internal memory and speed of processing. They are used in specialized environments where dust, temperature and humidity are carefully controlled. It has large amount of external storage. The size of internal memory is usually more than 32 gigabytes of storage. They are mostly used in large establishments, banks, universities and research centers for processing large data.

CLASSIFICATION OF COMPUTER BY PURPOSE

       I.            General purpose computers: Microcomputers are examples of general computers because it can be used to run different application packages. They are computers designed to solve a wide range of problems. They perform many functions because there are various type of application programs stored in them.

     II.            Special purpose computers: these are computer system designed to perform only one function e.g. ultrasound machine used by doctors in scanning human body. It is designed to solve a unique problem.



ASSIGNMENT

List 5 special purpose computers with their functions
 

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