**TRS -80 Commercial**

**Some Interesting Videos of the Past**

**Apple Macintosh 1984 First Commercial**

**1984 IBM Personal Computer Commercial**

**The Babbage Engine**

**Steve Jobs introduces Macintosh**

**Who invented Computer?**

**History Of Computers**

Modern digital computers came into existence in the last two decades of the 20th century. However the history of computers date back 2000 years to the era of abacus.**Abacus and early calculators**

Abacus was invented in the Middle East during the year 500 BC. In the year 1642 a French scientist Blaise Pascal invented the first mechanical calculator. In 1671 a German mathematician and philosopher Gottfried Leibniz who invented a more advanced calculator that useed a stepped drum to do addition subtraction multiplication division and work out square roots of numbers. Leibnz is also credited to have invented the binary number system. An Englishman named George Boole in the year 1854 invented a new branch of mathematics known as Boolean algebra. Boolean algebra and binary number system are extensively used in modern digital computers.**Mechanical computers**

During the late eighteenth century and early nineteenth Century the focus shifted from calculators that require human intervention to computers that were programmable and capable of working automatically. Charles Babbage is credited to be the father of modern computers. Charles babbage's computer had an input, a memory, a processor and an output which are the characteristics of a modern computer. An American statistician Herman Hollerith built one of the world's first practical calculating machines. Hollerith's computer was called the tabulator and was used extensively to process census data in the United States during the early 19th century.

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