The working principles of today's computers were provided by an English mathematician. 

In fourth generation computers ___________ were used.

Abacus was the first calculating device invented in _________

The fifth generation computer device is based on _________.

___________ could add, subtract, multiply and divide automatically.

In third generation computers _________ helps to increase the speed and efficiency of computers.

In _________, John Napier invented a calculating device called Napier's Bones.

Thousands of integrated circuits were built on a single chip called _________.

Second generation computers were used in __________ period.

Improved Pascal's machine could perform _________.