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A computer is an electronic device that manipulates information or data. It can store, retrieve and process data.

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It was called the Atanasoff-Berry Computer (ABC). because it was built by Dr. John V. Atanasoff and Clifford Berry. This computer had used 18,000 vacuum tubes for processing.

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When this computer was turned on for the first time lights would dim parts of the area it was in.

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This transistors that were used were cheaper, consumed less power, more compact in size, more reliable and faster than the first generation machines made of vacuum tubes. In addition to that, it hosted over 100 computer programming languages.

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As time progressed computers became smaller in size, reliable, and efficient. Due to  transistors, resistors, and capacitors along with the associated circuitry.

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Images
Third Generation of Computers - 1965 - 1970

thehistoryofcomputers2014.weebly.com

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Taking data and instructions from a user, processing the data as per instructions, and displaying or storing the processed data. This is known as input function, process function, output function, and storage function, respectively.

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1). Output Devices (monitor, speakers etc).
2). Output Devices (monitor, speakers etc)

3). Secondary Storage Devices (hard disk drive, CD/DVD drive etc).
4). Processor and Primary Storage Devices (cpu, RAM).