Keyboard And Screen Input DevicesKeyboard:Introduction:Keyboard is an external input peripheral device that can be attached to the computer processor.
It has set of keys representing the alphabet and numbers. The alphabet keys in keyboard are laid out in QWERTY style. Working:When a key is pressed, it results in a generation of a 8-bit binary word in ASCII code. It is sent out from the keyboard using serial data transmission, which is a data word sent one bit at a time. The interface stores the received character from keyboard until the processor performs the instructions accordingly.
Speed:A serial connection from the keyboard will take each keystroke and feed it to the interface which will have a buffer.Compatibility:Keyboards can be connected to computer systems depending upon the Operating System of the computer and the interface used. Some keyboards use wireless technology so that the keyboard does not need a physical connection to the computer.Key Composition: The standard keyboard has Alphabetic, Alphanumeric, Modifier, Cursor, System Commands, Miscellaneous and Numeric keys (Multiple layouts and Layout changing software). Depending on the system, the key composition may vary.
Types:Standard, Laptop Inbulit, Flexible, Handheld, Thumbsized, Multifunctional, Projection, Optimal, On Screen, Chorded.Screen Input Devices:On-Screen Keyboard and Touch Screen KeyboardScreen Input Devices are On-Screen Keyboard and Touch Screen Keyboard. They inherit basic properties from the conventional keyboard. They differ in the form of their physical existence and the way in which input is provided to them.It is a software component that is used to enter data (characters/numbers).It has a feature, which provides an advantage to operate it with multiple screen input devices like on-screen keyboard and touch screen keyboard.
Types of Screen Input Devices:They are broadly classified into two types, On-Screen Keyboard and Touch Screen Keyboard which are further classified as:Physical keyboards with different keys consisting of electronically changeable displaysVirtual keyboards with touch screen keyboard layoutsVirtual keyboards to allow input from a variety of input devicesOptically detected human hand and finger motionsOptically projected keyboard layouts Online virtual keyboards for multiple languagesIt can also help the person with disability and the person’s facing problem in physical typing. It is also secured, as can be seen on many net-banking websites of different banks to provide user with on-screen keyboard.Submitted By:Name: Anish JainRoll No.:16BIT012Title: CPW TUTORIAL-1, Keyboard and Screen input devicesDate: 29/01/2018