External devices that enable the user to see or hear the results of the computer's data processing are known as output devices. The results are output in either hardcopy or softcopy form. Hardcopy output can be held in your hand, such as paper with text (word or numbers) or graphics printed on it. Softcopy output is displayed on a monitor.
Monitor is a component with a video display or screen for viewing computer data, television programs, etc. Displays usually take one of two forms: a video screen with a cathode ray tube (CRT) or a video screen with a liquid crystal display (LCD).A CRT-based screen, or monitor, is similar to a television set.An LCD-based screen displays visual information on a flatter and smaller screen than a CRT-based video monitor. LCDs are often used in laptop computers.
Printers produce hard copy – a printed version of information stored in one of the computer's memory systems. Color ink-jet and black-and-white laser printers are the most common, though the decreasing cost of color laser printers has increased their use outside of the publishing industry3.
Most PCs also have audio speakers. These allow the user to hear sounds, such as music or spoken words that the computer generates.
A modem is an I/O device that connects a computer to a telephone line or cable television network and allows information to be transmitted to or received from another computer.
The digital signal sent from one computer is converted by the modem into an analog signal, which is then transmitted by telephone lines or television cables to the receiving modem, which converts the signal back into a digital signal that the receiving computer can understand.
Notes: 1dozens – ìíîæåñòâî;
2single-sided disk – îäíîñòîðîííèé äèñê (ñ çàïèñüþ íà îäíîé ñòîðîíå);
3publishing industry – èçäàòåëüñêîå äåëî;