Keyboard And ScreenInput DevicesKeyboard:Introduction:Keyboard isan external input peripheral device that can be attached to the computerprocessor. It has set of keys representing the alphabet and numbers.
Thealphabet keys in keyboard are laid out in QWERTY style. Working:When a keyis pressed, it results in a generation of a 8-bit binary word in ASCII code. Itis sent out from the keyboard using serial data transmission, which is a dataword sent one bit at a time. The interface stores the received character fromkeyboard until the processor performs the instructions accordingly. Speed:A serialconnection from the keyboard will take each keystroke and feed it to theinterface which will have a buffer.
Compatibility:Keyboardscan be connected to computer systems depending upon the Operating System of thecomputer and the interface used. Some keyboards use wireless technology so thatthe keyboard does not need a physical connection to the computer.Key Composition: The standard keyboard hasAlphabetic, Alphanumeric, Modifier, Cursor, System Commands, Miscellaneous andNumeric keys (Multiple layouts and Layout changing software).
Depending on thesystem, the key composition may vary.Types:Standard,Laptop Inbulit, Flexible, Handheld, Thumbsized, Multifunctional, Projection,Optimal, On Screen, Chorded.Screen Input Devices:On-Screen Keyboard andTouch Screen KeyboardScreen InputDevices are On-Screen Keyboard and Touch Screen Keyboard. They inherit basicproperties from the conventional keyboard. They differ in the form of theirphysical existence and the way in which input is provided to them.
It is asoftware component that is used to enter data (characters/numbers).It has afeature, which provides an advantage to operate it with multiple screen inputdevices like on-screen keyboard and touch screen keyboard.Types of Screen Input Devices:They arebroadly classified into two types, On-Screen Keyboard and Touch Screen Keyboardwhich are further classified as:1) Physical keyboardswith different keys consisting of electronically changeable displays2) Virtual keyboardswith touch screen keyboard layouts3) Virtual keyboardsto allow input from a variety of input devices4) Optically detectedhuman hand and finger motions5) Optically projected keyboard layouts 6) Online virtualkeyboards for multiple languages It can alsohelp the person with disability and the person’s facing problem in physicaltyping. It is also secured, as can be seen on many net-banking websites ofdifferent 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