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History of Computers
by Harjot Gosal
# History of Computers

## Abacus

### Used by the Babylonians in 300 BC

### Used for Mathematical Problems.

## Logarithms

### invented in 1617

### By John Napier

## Stepped Reckoner

### was able to add , multiply,
subtract and divide

### invented by Gottfried Wilhelm
Leibniz

## Pascaline

### invented in 1642

### by a 19 year old named
Blaise Pascal

### didnt sell alot because the
prices were too high

### Could only add

## Punch Cards

### Frenchmen Joseph Marie
Jacquard came up with the
idea

### in 1801

## Analytic Engine

### In 1822 , invented by
mathematician Charles
Babbage

### device was large as a house
and powered by 6 steam
engines

### punched paper could be used
as a storage mechanism

## Hollerith desk

### made by Hollerith ,which
consisted of a punch card
reader that sensed the
holes in the card and a
large dial indicator that
showed results of the
count

### Built the company IBM

### punch cards were used to track

## Mark 1

### Built on a partnership
between Harvard and IBM in
1944. U.S millitary needed a
mechanical computer to do
scientific calculations

### weighed 5 tons , 500 miles of
wires and 8 feet 11 inches tall

### a moth was found by
Grace Hopper in the
Mark 1 . Grace
Hopper was a
programmer for the
Mark 1.

## Z3

### Built by Konrad Zuse in 1941

### the first

## ENIAC

### was a all electronic
digital computer

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Basically rings that slide over a rod

First ever calculator

Could do subtraction and addition

allowed you to do multiplication

were a bunch of sticks with numbers

was considered the first to advicate the use of the binary system

instead of gears there wear 10 flute drums

had metal wheels

had digits 0 -9

wooden cards

really big in the mill industry

used on trains for puncards

Had a condtional statement : allows programs to acheive different results everytime its runned

operatedon numbers that were 23 digits wide. Also could add and subtract and multiply and divide in less then 10 seconds.

had more then 18,000 vacuum tubes and filled a room, to reprogram the ENIAC you would have to switch about 3000 cords