Name: Parthesh SoniRoll No: 16bit015 Keyboard Keyboard is the board which consists of various keys on its suface, which are needed for inputting to the computer. The keyboard has keys which when pressed, transmits electric pulses in the form of 0s and 1s.
Mainly the keyboard is used for text and numeric entry, but it also supports many symbols for entry. History: The design of the keyboard is similar to the design of earlier type writers. The keyboard was made with that design so that the changes won’t affect the users much. Before keyboards, the input device used was punch cards. The punch card used was such that common people cannot use them. Hence to eliminate the hurdle in data input. keyboard was invented.
Types of Keyboard:- Standard keyboard: There are total 104 keys in a standard keyboard. This type of keyboards are mainly used as a component in Personal Computers for home or office use. These types of keyboards can be purchased seperately.
– Laptop keyboard: This type of keyboard comes inbuilt with the laptops. Such keyboards are mainly smaller in size and the keys are also small and lesser in number. The placement of the keys is bit different in such type.
The switch mechnism of such keyboard is of switch type. Standard keyboards can also be connected to laptops and can be used for text entry and number entry. -Gaming and multimedia keyboard: These keyboards are rugged and are decorated with colorful LEDs and backlight. Mainly, these keyboard produces clicky sound when pressed and are mechanical in nature. Categorizing the keyboard based on their connection with the main body of the computer, they are divided into two types: Chorded Keyboard: This type of keyboard is connect to the main body using wires and cables. The electrical pulses transmitted to the main body are passed through the wire.Chord-less keyboard: This type of computer is connected to the main body using bluetooth connection or wifi connection. Data is transmitted using Bluetooth or wifi signalOnscreen keyboard: This type of keyboard is not a hardware component, but is a part of software component.
The software is such that if any button is clicked with mouse or touched in case of smartphones, the key is considered pressed and the data interpreted accordingly. Further there are many other types of keyboards such as Qwerty Keyboard, voice typing keyboards. Some keyboards also have keys which are responsible for cursor movements. Mainly the keyboards are system architecture neutral, ie. Keyboard of a Windows machine can be effectively used in Linux machine and vice versa.Working: When the key of the keyboard is pressed, a 8-bit binary sequence is generated corresponding to that key. This sequence is according to ASCII value of the key.
Then the ASCII sequence is transmitted to the system using serial transmission as only one sequence should be transmitted at one time. The whole word is sent bit by bit in the serial transmission.Till the whole word is transmitted, the bits are stored in the buffer in the interfaceThe cost of the keyboard ranges from $5 and follows upto $20-30 depending upon the company which manuactured it.