 Subjects you may see in your mid term exam.

Early machine used for counting and maths.
Invented 3 thousand years ago.
Invented by the Chinese and Arabic nations.
Ancestor of the modern computer.
The Slide Rule
Used for multiplication and division as
well
as some scientific functions.
Invented around 1620 in England.
Used by engineers in the 1950’s and
1960’s until the invention of the computer
and calculator.
Used by early pilots and astronauts!

Born 26th December 1791. Died age 79 on the
18th October 1871.
An English Mathematician who invented the
idea of a programmable computer.
Scientific study and a dislike of untidiness
helped him come up with his invention.
Babbage wanted to find a method by which maths
could be calculated mechanically, removing
human sources of error.
His inventions were never completed as he
never had enough money.
A fully working replica of his machine was
completed in 1991 using his original plans.

Charles Babbage created the idea of the use
of punched cards as a way to control a
mechanical calculator designed by him.
Herman Hollerith developed punched card data
processing technology in 1890.
Tabulating Machine Company was formed in 1890
by Herman and this later became known as IBM.
Punch cards still used in the 1970’s up until the
modern day computer became more popular.
Punch cards used by
governments, banks, schools
and police to store and retrieve
information or data.

Analogue – Older style computers and machinery
that
use mechanical parts such as springs, wires and
circuits to work and manage data.
Simple analogue machine, an analogue watch:
Not as reliable or accurate as digital.
Digital – Data is managed by electronic signals.
Modern computers and equipment such as
mobile phones and mp3 players all use digital
technology.
An electronic digital watch.
Faster and more powerful than analogue technology.

Developed in the late 1960’s using digital
technology.
The “chip” or “processor” found in all
modern personal computers.
Acts as the CPU (Central Processor Unit)
for a computer, the part of the computer
that processes and manages data.
Sometimes called the brain of a computer.
Scientists have recently invented a plastic processor which will allow
for even more impressive technology, for example computers in food
packaging or clothes!
It is this technology will also help reduce the price of computers.