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CPU central processing unit CRT cathode-ray tube-a picture tube device in a computer monitor; made up of millions of pixels, or tiny dots. Pixels are illuminated by an electron beam that passes back and forth across the back of the screen ery quickly so that the pixels appear to glow continuously. Dvorak keyboard-that puts the most commonly used letters n the English language of home keys. ergonomics how a user sets up his or her computer and other equipment to minimize risk of injury or discomfort. FireWire an interface prot that transfers data inkjet printer nonimpact printer that sprays timy drops of ink onto paper. laser printer nonimpact printer known for quick and quiet production and high quality printouts. LCD liquid crystal display-technology used in flat-panel computer monitors microphone device for capturing sound waves such as voice and converting them to an electrical signal monitor a common output device that displays text, graphics, and video as soft copiesthat can be seen only on-screen mouse device used to enter user responses and commands into a computer optical devices that use a laser to read sensor sends signals to the computer QWERTY keyboard-that gets its name from the first six letters on the top-left row of alphabetickeys on the keyboard RAM random access memory-the computers temporary storage space of short term memory. it is located as a set of chips on the system units motherboard,, and its capacity is measured in megabytes and gigabytes. ROM read only memory- set of memory chips located on the motherboard that stores dat AND INSTRUCTIONS THAT CANNOT BE CHANGED OR ERASED; it holds all the instructions the computer needs to start up speakers an output device used for sound; included with most computers. system unit the metal or plastic casse that holds all the physicl parts of the computer together. USB universl serial bus port-port that can connect a wide variety of peripherals to the computer