Master Akinyemi Akintunde (A.K.A LAGBE) Computer package Hand Hand-
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What is a Computer?
A computer is a programmable machine. The two principal characteristics of a principal
computer are: it responds to a specific set of instructions in a well-defined manner defined
and it can execute a prerecorded list of instructions (a program). Modern Computers Defined
Modern computers are electronic and digital. The actual machinery -- wires, transistors, and circuits -- is called hardware; the instructions and data are called software.
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.
In addition to these components, many others make it possible for the basic components to work together efficiently. For example, every computer requires a bus that transmits data from one part of the computer to another. Computer Classification, By Size and Power
Computers can be generally classified by size and power as follows, though there is considerable overlap:
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.
The most important piece of software on any computer is the operating system. The operating system gives the framework upon which all other services and applications run. The majority of home users use a Windows based machine. Most of today’s applications and games are designed to run solely on Microsoft systems.
Microsoft Windows is extremely popular in schools and colleges, many businesses also use Windows.
Introduction to Microsoft Windows
The oldest of all Microsoft’s operating systems is MS-DOS (Microsoft Disk Operating System). MS-DOS is a text-based operating system. Users have to type commands rather than use the more friendly graphical user interfaces (GUI’s) available today. Despite its very basic appearance, MS-DOS is a very powerful operating system. There are many advanced applications and games available for MS-DOS. A version of MS-DOS underpins Windows. Many advanced administration tasks in Windows can only be performed using MS-DOS.
The history of Microsoft Windows dates
back to 1985, when Microsoft released Microsoft Windows Version 1.01. Microsoft’s aim was to provide a friendly user-interface known as a GUI
(graphical user interface) which allowed for easier navigation of the system features. Windows 1.01 never really caught on. (The amazing thing about Windows 1.01 is that it fitted on a single floppy disk!). In 1987 Microsoft revamped the operating system and released Windows 2.03. The GUI was very slightly improved but still looked too similar to Windows 1.01. The operating system again failed to capture a wide audience.
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