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Showing posts from July 31, 2013

Development of Computers

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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

Power lines and interfacing in a computer

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Download free latest unlimited KCSE revision papers @ www.manyamfranchise.com Author: Atika M. Nyamoti Power lines and interfacing in a computer  An interface is a tool and concept that refers to a point of interaction between components, and is applicable at the level of both hardware and software. Most computer interfaces are bi-directional, but the mouse or graphics adapter are uni-directional.