A Brief History of Computers

Front

_______ invented the binary number system 300 BC

Back

Pingala

Front

the first known calculator, was invented in Babylonia (2400 BC)

Back

The abacus

Front

_____ invents machines which follow a series of instructions.

Back

60 AD (Heron of Alexandria )

Front

In 1642, Blaise Pascal invents the 'Pascaline', a _______ machine.

Back

mechanical adding

Front

In 1822, ______

was invented by Charles Babbage.

Back

Analytical Engine

Front

Samuel Morse

Back

invents Morse code. (1835 )

Front

In 1880 Alexander Graham Bell invents a telephone called the _____

Back

Photophone.

Front

In 1895 Radio signals invented by _____

Back

Guglielmo Marconi.

Front

International Business Machines

Back

IBM is formed on June 15, 1911.

Front

1912

Back

Alan Turing born on 23rd June 1912.