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History of Computers by Mind Map: History of Computers
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History of Computers

All Digital Computers

ENIAC

Stands for Electronic Numerical Integrator and Calculator

Built in the University of Pennsylvania, Built between 1943 and 1945 by John Mauchly and J. Presper Eckert,

Big machine that filled up a 20 by 40 ft room

Weighed 30 tonnes

Used over 18,000 vacuume tools

Rooms had to be air conditioned because machines would use a lot of power which generated a lot of heat

Could only hold 20 numbers at a time

The Abacus

Used for mathematical calculations

Could do addition and subtraction

People mistaken the Chinese for being the first to use it when it was really the Babylonians

The modern ones have rods where the pebbles can slide back and forth, while the older ones don't have the rods

The Logarithm

1617 created by John Napier

Could be used to do mulitiplication

Led to the "Slide Rule"

First built in 1632

In the 1960's was used by the Nasa engineers, New node

Calculating Clock

Invented by Wilhem Schickard in 1623

First gear driven calculating machine

Didn't get a lot of publicity because Wilhem died right after he created it

The Pascaline

1642 created by Blaise Pascal, at age 19

Created it to help his father who was a tax collector

Could only add

Didn't sell a lot because of the price

Wasn't as accurate

Stepped Reckoner

Created by Gottfried Wilhelm Leibniz

It could add, subtract, divide, and multiply

He was the first one to use the binary system

He died poor

Punched Cards

1801 Joseph Marie Jacquard invented a power loom

Had your name, adress, phone number etc on it

Your gas bill would come with a punch card

Had your name, adress, etc

Difference Machine

Created by 1822 Charles Babbage

Machine was the size of a room

Had government funding, which costed a lot of money

Was never finished because of money issues

Analytic Engine

Large as a house, powered by 6 steam engines

Punched cards were used

The 2 main parts were the "store" and the "mill", Today this is called the memory unit, and the central processing unit (CPU)

Hollerith Desk

Had a card reader

Sensed the holes in the cards

Gear driven mechanism

Large wall of dial indicators shows the count

Census machine was the first machine ever to be on a magazine cover

Mark 1 Computer

Partnership between havard and IBM in 1944

IBM, Hollerith built a company called Tabulating Machine Company, Later renamed to International Business Machine (IBM), This business grew rapidly, Began to create mechanical calculators for business sales

First digital computer created in the US

Weighed 5 tons

500 miles of wire

8 ft tall and 51ft long

Ran non stop for 15 years

Waterpowered

Could only store 72 numbers

Calculated digits that were 23 digits long

Grace Hopper

1953 she created the first high level language "flow matic"

Compiler

Program used to translate things into binary language

Apple 1

Steve Wozniack created the Apple I

Could be plugged into your tv

Had a keyboard

They were sold for about $500 each

J.V Atanasoff

Built a digital computer

Colossus, Built during World War 2 by Britain, Built it to break cryptographic codes used by Germany, Zuse, Konrad Zuse built the Z1 between 1936-1938, The Z3 was built in 1941, First software controlled computer, Used binary repersentation for numbers, Was destroyed by the Allied Bombing raid, Made by Konrad Zuse, via "punch film", He lived from 1910-1995, Designed to do difficult calculations, Structure of a "modern computer", punch tape reader, central unit, floating point artitute unit, input and output devices, Weighed a 1000kg

No gears, belts, shafts etc

Bill Gates

Went to Harvard and as a freshman he dropped out

Dropped out because he wanted to create and design new programs for his computer