of monitors available such as CRT (Cathode Ray Tube), LCD (Liquid Crystal Display) and LED (Light Emitting Diodes). The monitor works with the VGA (Video Graphics Array) card. The video graphics card helps the keyboard to communicate with the screen. It acts as an interface between the computer and display monitor.
Usually the recent motherboards incorporate built-in video card. The first computer monitor was part of the Xerox Alto computer system, which was released on March , . ( ) Plotter: Plotter is an output device that is used to produce graphical output on papers. It uses single color or multi color pens to draw pictures.
Figure . Monitor Figure . Plotter ( ) Printers: Printers are used to print the information on papers. Printers are divided into two main categories: • Impact Printers • Non Impact printers Impact Printers T h e s e printers print with striking of hammers or pins on ribbon.
These printers can print on multi-part (using carbon papers) by using mechanical pressure. For example, Dot Matrix printers and Line matrix printers are impact printers. A Dot matrix printer that prints using a fixed number of pins or wires. Each dot is produced by a tiny metal rod, also called a “wire” or “pin”, which works by the power of a tiny electromagnet or solenoid, either directly or through a set of small levers.
It generally prints one line of text at a time. The printing speed of these printers varies from to CPS (Character Per Second). Line matrix printers use a fixed print head for printing. Basically, it prints a page-wide line of dots.
But it builds up a line of text by printing lines of dots. Line Figure . Impact Printer printers are capable of printing much more than Lines Per Minute, resulting in thousands of pages per hour. These printers also uses mechanical pressure to print on multi-part (using carbon papers).
Non-Impact Printers These printers do not use striking mechanism for printing. They use electrostatic or laser technology. Quality and speed of these printers are better than Impact printers. For