class3-history

# Class3-history - History of Computer Science The Telephone When was the telephone invented 1876 Who invented it Alexander Graham Bell What makes

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History of Computer Science

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The Telephone When was the telephone invented? 1876 Who invented it? Alexander Graham Bell What makes something a telephone? What was the key idea behind the telephone? transmission of sound on a wire the microphone and speaker
The Airplane When was the airplane invented? 1903 Who invented it? The Wright Brothers What makes something an airplane? heavier-than-air craft capable of flight with stationary wings What is the key idea behind the airplane? airfoil, lift

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The Computer When was the computer invented? Who invented it?
Some Candidates 1941 - Zuse Z3 (Germany) 1942 - Atanasoff-Berry Computer (US) 1944 - Colossus Mark 1 (UK) 1946 - ENIAC (US) 1949 - EDSAC (UK)

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The Computer What makes something a computer? What is the key idea behind the computer?
Discrete States Computation depends on discrete states. Consider the robot's direction. How many possible states?

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Operations Computation consists of operations. The simplest operation we can perform is to copy a state. copy copy
Noise In the real world, no operation is perfect. There is always noise. copy

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Fixing Errors If the robot's direction can only be one of 4 possible discrete values, and we see this: then we can fix it: Why can't we fix it if we allow the robot to point in ANY direction?
Back to History "It is desirable to guard against the possibility of exaggerated ideas that might arise as to the powers of the [computer]. .. The

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## This note was uploaded on 09/14/2010 for the course CS 15-100 taught by Professor Dave during the Spring '08 term at Carnegie Mellon.

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Class3-history - History of Computer Science The Telephone When was the telephone invented 1876 Who invented it Alexander Graham Bell What makes

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