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It is used to select a displayed menu item or draw pictures on the monitor screen. Light pen is a pointing device similar to a pen. It is mainly used in Computer Aided Designing (CAD) and playing computer games. The function of the joystick is similar to that of a mouse. The joystick can be moved in all four directions. The lower spherical ball moves in a socket. It is a stick having a spherical ball at its both lower and upper ends. Joystick is also a pointing device, which is used to move the cursor position on a monitor screen.
FDTD LIGHT SOURCE USER INPUT WINDOWS
Keyboards are of two sizes 84 keys or 101/102 keys, but now keyboards with 104 keys or 108 keys are also available for Windows and Internet. The layout of the keyboard is like that of traditional typewriter, although there are some additional keys provided for performing additional functions. Keyboard is the most common and very popular input device which helps to input data to the computer. Following are some of the important input devices which are used in a computer −