Evolution of Computer A.P.Mohana priyaa Abacus Chinese invented calculating device called ABACUS Ø Also known as “SOROBAN” perform addition and Ø subtraction Wooden rack holding two horizontal wires with beads Ø strung on them. Rules memorized by the user Ø Regular arithmetic problems can be done Ø NAPIER’S DEVICE John Napier a Scottish Mathematician Ø Set of eleven animal bones later it was replaced by Ø rod Number marked on them‚they placed
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teleprinter-style keyboards became the main input device for computers. A keyboard typically has characters engraved or printed on the keys and each press of a key typically corresponds to a single written symbol. However‚ to produce some symbols requires pressing and holding several keys simultaneously or in sequence. While most keyboard keys produce letters‚ numbers or signs (characters)‚ other keys or simultaneous key presses can produce actions or computer commands. Despite the development of alternative
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HISTORY OF COMPUTER THE PRE-MECHANICAL AGE: 3000 B.C. – 1450 A.D. 1. Writing and Alphabets – Communication First development of signs corresponding to spoken sounds‚ instead of pictures‚ to express words. Around 2000 B.C.‚ Phoenicians created symbols that expressed single syllables and consonants (the first true alphabet) The Greeks later adopted the Phoenician alphabet and added vowels; the Romans gave the letters Latin names to create the alphabet we use today. 2. Paper
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believe that computers are more a hindrance than a help in todays’s world. Others feel that they are such indispensable tools that they would not be able to live or work without them. - In what ways are computers a hindrance - What is your opinion? Nowadays we can see computers increase their popularity; however‚ using computer too much may lead to negative results. Some people believe that computers have more adverse effects than their helps while others comment that computers are necessary
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COMPUTER CONCEPTS NATIONAL ASSOCIATION FOR THE BLIND NEW DELHI Computer Concepts Hardware & software concepts explained for persons with low or no vision for the students of Intel Technology Training Lab at National Association for the Blind‚ New Delhi Produced and Published by National Association for the Blind Sector-5‚ R.K Puram‚ New Delhi E-mail: nab@vsnl.com First Edition October 2001 Reprint: February 2005 TABLE OF CONTENTS
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in using computers? · What are the purposes of elementary students in using computers? > educational purposes such as research. > Entertainments like playing online games. · What are the implications of computer’s exposure to students in terms of: > Cognitive (involved in learning‚ knowing‚ and understanding things) POSITIVE EFFECT = Helps to widen their learnings = They can develop their communication skills. NEGATIVE EFFECTS = Ma prone sila sa mga content sa computer na dili
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Date | Event | c. 2400 BC | The abacus - the first known calculator‚ was probably invented by the Babylonians as an aid to simple arithmetic around this time period. This laid the foundations for positional notation and later computing developments. | 1300 | Ramon Llull invented the Lullian Circle: a notional machine for calculating answers to philosophical questions (in this case‚ to do with Christianity) via logical combinatorics. This idea was taken up by Leibniz centuries later‚ and is thus
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HISTORY OF COMPUTERS Ancient era Suanpan (the number represented on this abacus is 6‚302‚715‚408) Devices have been used to aid computation for thousands of years‚ mostly using one-to-one correspondence with fingers. The earliest counting device was probably a form of tally stick. Later record keeping aids throughout the Fertile Crescent included calculi (clay spheres‚ cones‚ etc.) which represented counts of items‚ probably livestock or grains‚ sealed in hollow unbaked clay containers.[1][2]
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Duy Lai EN 110 AI Mr. Schuh 10/15/14 Computer Computer is the most amazing gift of science. Almost everyone have one or more computer. This device was developed by Charles Babbage. Computer is a part of our life today. Computer can be used on many thing like school‚ business‚ government and etc... we can see computer anywhere we go around the world. Computer is so amazing with many functions. Four basic function if computer are input‚ processing‚ output and storage. Input collectively refers to
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1944(Destroyed) Cost: $6500 Size: Two 6’ x 3’ x1’ Memory racks Technology: Relays Memory : 64 22-bit floating point words Program: 35mm punched film Speed : 0.5 Operations per second Application: Circuit Analysis‚ defense‚ prototype Atanasoff-Berry Computer(ABC) Inventor : John V. Atanasoff Builder : Atanasoff and Berry Operational : 1942 Cost : $ 7000 Size : 6’ x 3’ x 3’ Technology : Tubes‚ capacitors‚ cards Memory : 64 50-bit words Program : Fixed‚ Matrix arithmetic calculator Speed : 32
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