Input and output Essay Example | Topics and Well Written Essays - 500 words

Input and output - Essay Example The keyboard is one such input device that inputs characters and instructions directly into the computer, where characters refer to text. On the other hand, instruction comes in the form of text and function keys that are specially programmed to deliver instruction. Other than the keyboard, there is a need to have pointing devices, based on the user interface that a computer uses, where graphical user interfaces require pointing devices. These include mice, touchpads, trackballs, trackpads and even touch screens, which position the cursor at different positions on the screen of the computer. Apart from the common input devices, there are other specialized devices used in input based on their application and the need to have them, which include scanners, magnetic ink character recognition, barcodes, voice input and graphic tablets. These are specialized, as they are not necessarily in every computer operation, for example, a bar code scanner is only used in points of sale to input the identity of an item on sale for the processing of its cost. After the data is input into the computer, it travels through the expansion bus and into the processor for computation creating a need to view the product (Patkay). In this case, output devices come into play and include visual, audio and graphical output. Visual output appears in the form of on-screen output where all information is displayed on a screen that could be and led, LCD or even a CRT monitor. The screen creates the first interaction with processed data or even data that has been input into the computer providing visual expression of data for users. Another form in which data can be output is through hard copies of data, where information is printed on paper and presented to a computer user. These produce both written numbers and letters while other create impressions of graphics, but are all based on

Portrait of a Leader - Andy Warhol Research Paper

Portrait of a Leader - Andy Warhol - Research Paper Example The paper "Portrait of a Leader - Andy Warhol" discusses the leader of the pop art, Andy Warhol. As a leader of a time that was typified by a collaboration of the bizarre with the mundane, Warhol has left a legacy that remains powerful and enigmatic. Andy Warhol was born on August 6, 1928 to Slovak immigrants and was raised near the city of Pittsburg, Pennsylvania. As a child, he was ill with scarlet fever which had the consequence of leaving him with an affliction known as St Vitus’ Dance, which left him with an involuntary jerking reflex in his limbs and face. The long term affects appear to have been a general lightening of the skin, hair, and eyes, which gave him a unique and ethereal look that was attractive to the art community of the 1960’s, but left him being unusual as a child. His own commentary about his high school years suggests that he felt isolated and apart from his peers. There are varying stories about the way in which Warhol grew up, partly because of the variety of stories that he himself spread in order to ‘create’ himself. One myth says his father worked in the coal mines of West Virginia and was home very little. He was then mostly raised by his mother, Julie, along with his brother. His father died in 1942 after a prolonged illness from drinking poisoned water after which his family struggled in poverty. Warhol claims that he had three nervous breakdowns in three consecutive years during his childhood - one each at the age of eight, nine, and ten.