HISTORY OF COMPUTER

The evolution of computers has six generations namely

• pre-modern era, first generation

• second generation, third, generation

• fourth generation and fifth generation

There are three classifications of devices that evolved during the ______ era namely manual-mechanical devices, electromechanical, and electronic devices.

An ancient memory aid device to record and document numbers, quantities, or even messages.

• Tally Sticks

• Napier’s Bones

• Abacus

• Oughtred’s Slide Rule

It is also called a counting frame and is considered the first man- made computing device. In fact, it was used for centuries. It uses beads and it was invented in China.

• Oughtred’s Slide Rule

• Napier’s Bones

• Abacus

• Pascaline Calculator

It is a manually-operated device used for calculating products, quotients, square and cube roots. It was invented by John Napier in 1614.

• Napier’s Bones

• Abacus

• Babbage’s Difference and Analytical Engines

• Stepped Reckoner

Mechanical analog computer consisting of movable bars with precise scales that uses approximations for solving problems: multiplication, division, roots, logarithms, and trigonometry. Invented by William Oughtred.

• Stepped Reckoner

• Pascaline Calculator

• Oughtred’s Slide Rule

• Abacus

It is also called Adding Machine. It is the first mechanical calculating device that uses cogged wheels that can be used to add and subtract two numbers. It was invented by Blaise Pascal in 1642.

• Abacus

• Napier’s Bones

• Stepped Reckoner

• Pascaline Calculator

Invented by Gottfried Wilhelm Leibniz in 1672. The machine can add, subtract, multiply, and divide automatically.

• Pascaline Calculator

• Stepped Reckoner

• Babbage’s Difference and Analytical Engines

• Abacus

Can compute tables

• Difference engine

• Analytical engine

Completely automatic and is capable of calculating any mathematical problems

• Analytical engine

• Difference engine