Computer hardware - information and communication technology, Essays (university) of Information Technology

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Computer Hardware

ICT1101/FND

Computer

Hardware Software

Main Parts of a Computer ICT1101/FND

What you can see from the outside?

• System Unit
• Monitor
• Keyboard
• Mouse
• Other peripheral devices ICT1101/FND

Basic Concepts of Computer Hardware

• This model of the typical digital

computer is often called the von

Neumann model.

CPU (Central Processing Unit) Input Units Output Units Primary Memory ICT1101/FND1120 (^3) - 5

Basic Concepts of Computer Hardware

• Input/Output (I/O): Refers to the process of getting information into and out of the computer. - Input: Those parts of the computer receiving information to programs. - Output : Those parts of the computer that provide results of computation to the person using the computer. ICT1101/FND

Sources of Data for the Computer

• Two types of data stored within a computer:
  • Original data or information : Data being introduced to a computing system for the first time. - Computers can deal directly with printed text, pictures, sound, and other common types of information.
  • Previously stored data or information : Data that has already been processed by a computer and is being stored for later use. - These are forms of binary data useful only to the computer. - Examples: Floppy disks, DVD disks, and music CDs. ICT1101/FND

Input Devices

• Two categories of input hardware:
  • Those that deal with original data.
  • Those that handle previously stored data.
• Input hardware: Those that deal with original data.
  • Keyboard
  • Mouse
  • Voice recognition hardware
  • Scanner
  • Digital camera ICT1101/FND

The Keyboard

• A computer keyboard is an input device used to enter characters and functions into the computer system by pressing buttons, or keys.
• Convert numbers, letters and special characters that people understand into electrical signals which were sent to the system unit where they will be processed accordingly.
• It is the primary device used to enter text. ICT1101/FND

The Keyboard Mode indicator lights Source: http://www.coolnerds.com/Newbies/Hardware/hardware.htm ICT1101/FND 13

The Keyboard

• Types of keyboards vary from full-sized to miniature and from rigid to flexible as: - Traditional Keyboards ICT1101/FND

The Keyboard

• Wireless Keyboards ICT1101/FND

The Keyboard

• PDA Keyboards ICT1101/FND

Pointing Devices- Mouse

• Mouse is an input device which is also called a pointing device.
• It is used to move the cursor on the screen.
• Mouse works in GUI(Graphical User Interface) mode. ICT1101/FND

Pointing Devices - Mouse

• Mouse controls the pointer that is displayed on the monitor.
• The mouse pointer usually appears in the shape of an arrow. ICT1101/FND