Development of Computers

Development of Computers The earliest known device to record computations was the abacus. It dates back to ancient times and was invented by the Chinese. Ten beads were strung onto wires attached to a frame. Addition and subtraction were read from the final positions of the beads. It was considered the first manual tool used in calculating answers to problems that provided information and in a primitive way storing the results. Abacus Mechanical Clock During the Middle Ages the first closed system in terms of calculating information was invented by use of a mechanical clock. The parts of the clock calculated the time of day. The time was displayed through the position of two hands on its face. The inventor pre-programmed the clock instructions through the manner in which the pull of the weights and the swing of the pendulum with the movement of the gears established the position of the hands on the clock face. Mathematics John Napier (Scotsman mid 1600s) discovered logarith

Classification of Computers

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Classification of computers

 Computers can be classified according to physical size, functionality and purpose as shown in the organizational chart below
computer classfication
Classification of computers

 1. Classification according to physical size

physical classification of computers
Classification of computers according to physical size

 Description of computers according to physical size

Description of computers according to their physical size
Description of computers according to their physical size
largest computer
Super Computer
largest computer
Super Computer is the Largest Computer

second largest computer
Main Frame Second Largest Computer

Mini Computer Third Largest Computer

Micro Computer-Laptop

Micro Computer-Desktop


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