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Glossary O operating system: A group of programs that controls the basic operation of a computer. Operating system functions include interpreting programs, creating data files, and controlling the transmission and receipt (input/output) of data to and from memory and peripheral devices. output: The results of a computer operation. Output commonly indicates data. 1) printed on paper, 2) displayed at a terminal, 3) sent through the serial port of internal modem, or 4) stored on some magnetic media. P parity: 1) The symmetrical relationship between two parameter values (integers) both of which are either on or off; odd or even; 0 or 1. 2) In serial communications, an error detection bit that is added to a group of data bits making the sum of the bits even or odd. Parity can be set to none, odd, or even. peripheral device: An I/O device that is external to the central processor and/or main memory such as a printer or a mouse. pixel: A picture element. The smallest dot that can be made on a display or printer. Also called a pel. plug and play: A capability with Windows that enables the system to automatically recognize connections of external devices and make the necessary configurations in the computer. port: The electrical connection through which the computer sends and receives data to and from devices or other computers. prompt: A message the computer provides indicating it is ready for or requires information or an action from you. R Random Access Memory (RAM): High speed memory within the computer circuitry that can be read or written to. restart: Resetting a computer without turning it off (also called "warm boot" or "soft reset"). See also boot. RJ11: A modular telephone jack. RJ45: A modular LAN jack. ROM: Read Only Memory: A nonvolatile memory chip manufactured to contain information that controls the computer’s basic operation. You cannot access or change information stored in ROM. User’s Manual Glossary-7