Gaza
Information Technology
What is a computer?
CXC notes
TUTOR: MR. G JAMES
It is an electronic device operating under the control of instructions stored in its own memory that can accept data, manipulate the data according to specified rules and produce results and store result for future use. Four fundamental functions are: 1. 2. 3. 4. Input Processing Output Storage
The computer comprises of a variety of hardware components. These include input device, output device, a system unit, storage device and a communication device. Input Device An input device is any hardware component that allows a user to enter data and instructions into computer. Input devices fall into four categories these are: Keyboard devices Point and draw devices Multimedia devices Automated input devices Keyboard devices Keyboard Point and draw devices Mouse Trackball Light pen Pointing stick Touch screen Touch pad Joystick Multimedia devices Pc camera Digital camera Microphone Web cam Automated input devices (devices that capture data directly from source) Optical Mark Reader Magnetic ink Character Reader Bar Code Reader Scanner
STUDY HARD AND MAKE YOURSELF PROUD
1
Information Technology
CXC notes Optical Character Reader RFID (radio frequency identification) Magnetic Stripe Card Reader Keyboard devices
TUTOR: MR. G JAMES
Keyboard-: This is an input device that is used to enter data, characters and commands into a computer. It is presently the main interfacing device of a command driven interface Point and draw devices Mouse-: This is a hand held point and draw device that contains at least one button. It is used to click on user interface items such as menus, buttons and icons. Trackball-: This is a ball used in a small external box or adjacent to or in the same unit as the keyboard; the trackball is rolled with the finger to move the cursor. Trackballs are mostly configured with portable computers. Light Pen-: This is a light sensitive input device which when it
What is a computer?
CXC notes
TUTOR: MR. G JAMES
It is an electronic device operating under the control of instructions stored in its own memory that can accept data, manipulate the data according to specified rules and produce results and store result for future use. Four fundamental functions are: 1. 2. 3. 4. Input Processing Output Storage
The computer comprises of a variety of hardware components. These include input device, output device, a system unit, storage device and a communication device. Input Device An input device is any hardware component that allows a user to enter data and instructions into computer. Input devices fall into four categories these are: Keyboard devices Point and draw devices Multimedia devices Automated input devices Keyboard devices Keyboard Point and draw devices Mouse Trackball Light pen Pointing stick Touch screen Touch pad Joystick Multimedia devices Pc camera Digital camera Microphone Web cam Automated input devices (devices that capture data directly from source) Optical Mark Reader Magnetic ink Character Reader Bar Code Reader Scanner
STUDY HARD AND MAKE YOURSELF PROUD
1
Information Technology
CXC notes Optical Character Reader RFID (radio frequency identification) Magnetic Stripe Card Reader Keyboard devices
TUTOR: MR. G JAMES
Keyboard-: This is an input device that is used to enter data, characters and commands into a computer. It is presently the main interfacing device of a command driven interface Point and draw devices Mouse-: This is a hand held point and draw device that contains at least one button. It is used to click on user interface items such as menus, buttons and icons. Trackball-: This is a ball used in a small external box or adjacent to or in the same unit as the keyboard; the trackball is rolled with the finger to move the cursor. Trackballs are mostly configured with portable computers. Light Pen-: This is a light sensitive input device which when it