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Chapter 1:Introduction to the world of computers

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Presentation transcript:

Welcome

Topic HISTORY OF COMPUTER

What is a Computer? A computer is a programmable machine. The two principal characteristics of a computer are: it responds to a specific set of instructions in a well- defined manner and it can execute a prerecorded list of instructions.

All general-purpose computers require the following hardware components: Memory: Enables a computer to store, at least temporarily, data and programs. Mass storage device: Allows a computer to permanently retain large amounts of data. Common mass storage devices include disk drives and tape drives. Input device: Usually a keyboard and mouse, the input device is the conduit through which data and instructions enter a computer. Output device: A display screen, printer, or other device that lets you see what the computer has accomplished. Central processing unit (CPU): The heart of the computer, this is the component that actually executes instructions.

Types of computer Personal computer Workstation Minicomputer Mainframe Supercomputer

Computer Classification, By Size and Power Personal computer Workstation Minicomputer Mainframe Supercomputer.

Personal computer A small, single-user computer based on a microprocessor. In addition to the microprocessor, a personal computer has a keyboard for entering data, a monitor for displaying information, and a storage device for saving data.

Workstation A powerful, single-user computer. A workstation is like a personal computer, but it has a more powerful microprocessor and a higher-quality monitor.

Minicomputer A multi-user computer capable of supporting from 10 to hundreds of users simultaneously.

Mainframe A powerful multi-user computer capable of supporting many hundreds or thousands of users simultaneously.

Supercomputer an extremely fast computer that can perform hundreds of millions of instructions per second.

History from beginning.. Computer History Year/Enter Computer History Inventors/Inventions Computer History Description of Event 1936 Konrad Zuse - Z1 Computer First freely programmable computer. 1951 John Presper Eckert & John W. Mauchly UNIVAC Computer First commercial computer & able to pick presidential winners. 1955 (In Use 1959) Stanford Research Institute, Bank of America, and General Electric ERMA and MICR The first bank industry computer - also MICR (magnetic ink character recognition) for reading checks. 1985 Microsoft Windows Microsoft begins the friendly war with Apple.