Short Notes: CRT Monitors, Keyboard, Inkjet printer, LAN Card, Digital Camera

(i) CRT Monitors

The cathode ray tube or CRT, invented by Karl Ferdinand Braun, is the display device that was traditionally used in most computer displays, video monitors, televisions, radar displays and oscilloscopes. The CRT developed from Philo Farnsworth's work was used in all television sets until the late 20th century and the advent of plasma screens, LCD TVs, DLP, OLED displays, and other technologies. As a result of CRT technology, television continues to be referred to as "The Tube" well into the 21st century, even when referring to non-CRT sets.

(ii) Keyboard

A hardware device consisting of a number of mechanical buttons (keys) which the user presses to input characters to a computer.

Keyboards were originally part of terminals which were separate peripheral devices that performed both input and output and communicated with the computer via a serial line. Today a keyboard is more likely to be connected more directly to the processor, allowing the processor to scan it and detect which key or keys are currently pressed. Pressing a key sends a low-level key code to the keyboard input driver routine which translates this to one or more characters or special actions.

Keyboards vary in the keys they have, most have keys to generate the ASCII character set as well as various function keys and special purpose keys, e.g. reset or volume control.

(iii) Inkjet printer

A class of printer in which small ink droplets are sprayed electrostatically from a nozzle onto the paper.

Inkjet printers are very quiet in comparison to impact printers.

A popular example is the Olivetti BJ10

(iv) LAN Card

Hardware in a computer that transmits the Ethernet, local area network (LAN) protocol over a line, wire or cable.
The ethernet card provides a standardized way of connecting computers together to create a network. Because DSL technology requirements far exceeds the lower speed limits of standard serial/parallel connections now uilt-in most PCs, a connection technology capable of interfacing at higher speeds was required; Ethernet technology, capable of sustaining traffic volumes of up to 10MB, was chosen as the technology of choice.

A network adapter that lets a computer connect to an Ethernet. The card can be a printed circuit board that is plugged into a computer or it can be built into the motherboard.

(v) Digital Camera

A camera that captures and stores still images as digital data instead of on photographic film.
The first digital cameras became available in the early 1990s[?].
A digital camera, is an electronic device used to transform images into electronic data. Modern compact digital cameras are typically multifunctional, with some devices cabable of taking photographs, video, and/or sound. 2005 saw a dramatic increase in consumer adoption of digital cameras as opposed to 35mm film cameras. North American sales of their digital counerpart exceeded, for the first time in history, sales of film cameras.