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See also reboot. boot disk — See system disk. boot priority (startup sequence) — The order in which the computer accesses its internal storage drives to locate the startup files. Under the default startup sequence, the computer looks for the startup files in the diskette drive before checking the internal storage drive. bus — An electrical circuit that connects the central processing unit (CPU) with other parts of the computer, such as the video adapter, disk drives, and ports. It is the pathway through which data flows from one device to another. See also bus speed, frontside bus. bus speed — The speed at which the central processing unit (CPU) communicates with the other parts of the computer. cache — A section of very fast memory in which frequently used information is duplicated for quick access. Accessing data from cache is faster than accessing it from the computer’s main memory. See also CPU cache, L1 cache, L2 cache. CD — An individual compact disc. See also CD-ROM. CD-ROM (compact disc read-only memory) — A form of high- capacity storage that uses laser optics instead of magnetic means for reading data. See also CD. Compare DVD-ROM. Glossary Glossary central processing unit (CPU) — The chip that functions as the “brain” of the computer. It takes information from outside sources, such as memory or keyboard input, processes the information, and sends the results to another device that uses the information. character — Any letter, number, or symbol you can use on the computer. Some characters are non-printing characters, such as a paragraph break in a word-processing program. A character occupies one byte of computer storage. chip — A small piece of silicon containing computer logic and circuits for processing, memory, input/output, and/or control functions. Chips are mounted on printed circuit boards. click — To press and release the pointing device’s primary button without moving the pointing device. In the Windows® operating system, this refers to the pointing device’s left button, unless otherwise stated. See also double-click. color palette — A set of specified colors that establishes the colors that can be displayed on the screen at a particular time. compatibility — The extent to which computers, programs, or devices can work together harmoniously, using the same commands, formats, or language as another. configuration — (1) The collection of components that make up a single computer system. (2) How parts of the system are set up (that is, configured). controller — A device that controls the transfer of data from a computer to a peripheral device and vice versa. For example, disk drives, monitors, keyboards, and printers all require controllers. CPU — See central processing unit (CPU). CPU cache — A section of very fast memory residing between the CPU and the computer’s main memory that temporarily stores data and instructions the CPU will need to execute commands and programs. See also cache, L1 cache, L2 cache. cursor — A symbol that indicates the current position on the screen. The shape of the cursor varies, depending on the program you are using and what you are doing. Glossary Glossary D default — The setting selected by a program when the user does not specify an alternative setting. device — A component attached to the computer. Devices may be external (outside the computer’s case) or internal (inside the computer’s case). Printers, disk drives, and modems are examples of devices. device driver — A program (called a “driver”) that permits a computer to communicate with a device. dialog box — An on-screen window displayed by the operating system or a program giving a direction or requesting input from the user. direct current (DC) — The type of power usually supplied by batteries. DC flows in one direction. Compare alternating current (AC). direct memory access (DMA) — A dedicated channel, bypassing the CPU, that enables direct data transfer between memory and a device. directory — See folder. disable — To turn a computer option off. See also enable. disc — A round, flat piece of material, designed to be read from and written to by optical (laser) technology, and used in the production of optical discs, such as CDs and DVDs. Compare disk. disk — A round, flat piece of material that can be magnetically influenced to hold information in digital form, and used in the production of magnetic disks, such as diskettes and hard disks. Compare disc. See also diskette, hard disk. disk drive — The device that reads and writes information and programs on a diskette or hard disk. It rotates the disk at high speed past one or more read/write heads. diskette — A thin, flexible disk in a protective jacket that stores magnetically encoded data. Diskettes can be removed from the computer and come in two sizes: 5.25-inch and 3.5-inch. Your computer uses 3.5-inch diskettes. See also double-density diskette, high-density diskette. document — Any file created with an application and, if saved to disk, given a...

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