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Visual C#® 2012: How to Program, Fifth Edition by Harvey Deitel, Paul Deitel

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1.4. Computer Organization

Regardless of differences in physical appearance, computers can be envisioned as divided into various logical units or sections.

Input Unit

This “receiving” section obtains information (data and computer programs) from input devices and places it at the disposal of the other units for processing. Most information is entered into computers through keyboards, touch screens and mouse devices. Other forms of input include receiving voice commands, scanning images and barcodes, reading from secondary storage devices (such as hard drives, DVD drives, Blu-ray Disc™ drives and USB flash drives—also called “thumb drives” or “memory sticks”), receiving video from a webcam or smartphone and having your computer receive information ...

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