Input/Output Devices
Chapter 9 Input/Output Devices
Contents:
I. Introduction II. Input Devices a. Keyboard,mouse,joystick,scanners,digital camera, bar code reader, touch Sreeen,Speech input device (microphone) III. Output Devices a. Monitor , Speaker, Printers ( different types) ----------------------------------------------------------------------------------------I. Introduction
The computer will be of no use unless it is able to communicate with the outside world. Input/Output devices are required for users to communicate with the computer. In simple terms, input devices bring information INTO the computer and output devices bring information OUT of a computer system. These input/output devices are also known as peripherals since they surround the CPU and memory of a computer system. Some commonly used Input/Output devices are listed in table below.
Input Devices Keyboard Mouse Joystick Scanner Light Pen Touch Screen
Output Devices Monitor LCD Printer Plotter
II. Input Devices
(a) Keyboard It is a text base input device that allows the user to input alphabets, numbers and other characters. It consists of a set of keys mounted on a board.
1
Alphanumeric Keypad/ Special-function Keys
Function Keys Cursor Movement Keys
Numeric Keypad
Figure 1: The Keyboard
Alphanumeric Keypad It consists of keys for English alphabets, 0 to 9 numbers, and special characters like + − / * ( ) etc. Function Keys There are twelve function keys labeled F1, F2, F3… F12. The functions assigned to these keys differ from one software package to another. These keys are also user programmable keys. Special-function Keys These keys have special functions assigned to them and can be used only for those specific purposes. Functions of some of the important keys are defined below. Enter It is similar to the ‘return’ key of the typewriter and is used to execute a command or program. Spacebar It is used to enter a space at the current cursor location. Backspace This key is used to move
Contents:
I. Introduction II. Input Devices a. Keyboard,mouse,joystick,scanners,digital camera, bar code reader, touch Sreeen,Speech input device (microphone) III. Output Devices a. Monitor , Speaker, Printers ( different types) ----------------------------------------------------------------------------------------I. Introduction
The computer will be of no use unless it is able to communicate with the outside world. Input/Output devices are required for users to communicate with the computer. In simple terms, input devices bring information INTO the computer and output devices bring information OUT of a computer system. These input/output devices are also known as peripherals since they surround the CPU and memory of a computer system. Some commonly used Input/Output devices are listed in table below.
Input Devices Keyboard Mouse Joystick Scanner Light Pen Touch Screen
Output Devices Monitor LCD Printer Plotter
II. Input Devices
(a) Keyboard It is a text base input device that allows the user to input alphabets, numbers and other characters. It consists of a set of keys mounted on a board.
1
Alphanumeric Keypad/ Special-function Keys
Function Keys Cursor Movement Keys
Numeric Keypad
Figure 1: The Keyboard
Alphanumeric Keypad It consists of keys for English alphabets, 0 to 9 numbers, and special characters like + − / * ( ) etc. Function Keys There are twelve function keys labeled F1, F2, F3… F12. The functions assigned to these keys differ from one software package to another. These keys are also user programmable keys. Special-function Keys These keys have special functions assigned to them and can be used only for those specific purposes. Functions of some of the important keys are defined below. Enter It is similar to the ‘return’ key of the typewriter and is used to execute a command or program. Spacebar It is used to enter a space at the current cursor location. Backspace This key is used to move