IBM 4851 514 Service Guide - Page 149
architecture.
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Updated October, 2008 combination of characters and symbols transmitted from one point to another. (4) A logical partition of the user device's data stream to and from the adapter. See also error message, operator message. MICR. See magnetic ink character reader and magnetic ink character recognition. module. A program unit that is discrete and identifiable with respect to compiling, combining with other units, and load; for example, the input to, or output from, an assembler, compiler, linkage editor, or executive routine. N network. (1) A configuration of data processing devices and software connected for information interchange. (2) An arrangement of nodes and connecting branches. Connections are made between data stations. network architecture. The logical structure and operating principles of a computer network. Note: The operating principles of a network include those of services, functions, and protocols. nit. A nit is a unit of luminance equal to one candela per square meter. It is often used to quote the brightness of computer displays. noise. (1) A disturbance that affects a signal and that can distort the information carried by the signal. (2) Random variations of one or more characteristics of any entity, such as voltage, current, or data. (3) Loosely, any disturbance tending to interfere with normal operation of a device or system. nonvolatile random access memory (NVRAM) . Random access memory that retains its contents after electrical power is shut off. Contrast with volatile memory. NVRAM. See nonvolatile random access memory. O operating system. Software that controls the execution of programs and that may provide services such as resource allocation, scheduling, input/output control, and data management. Although operating systems are predominantly software, partial hardware implementations are possible. (T) Operating System/2® (OS/2®). A set of programs that control the operation of high-speed large-memory IBM Personal Computers providing multitasking. Contrast with Disk Operating System (DOS). operator. A person who operates a machine. operator message. A message from the operating system or a program telling the operator to perform a specific function or informing the operator of a specific condition within the system, such as an error condition. option. (1) A specification in a statement, a selection from a menu, or a setting of a switch, that can be used to influence the execution of a program. (2) A hardware or software function that can be selected or enabled as part of a configuration process. (3) A piece of hardware (such as a network adapter) that can be installed in a device to modify or enhance device function. OS. Operating system. OS/2. Operating System/2. P page. The information displayed at the same time on the screen of a display device. panel. (1) A thin flat sheet, usually (a) of pressed metal and carrying controls and indicators, (b) of glass, or (c) of plastic. (2) A formatted display of information that appears on a display screen. parallel port. A port that transmits the bits of a byte in parallel along the lines of the bus, one byte at a time, to an I/O device. On a personal computer, it is used to connect a device that uses a parallel interface, such as a dot matrix printer, to the computer. Contrast with serial port. PC. See personal computer. personal computer (PC). A desk-top, free-standing, or portable microcomputer that usually consists of a system unit, a display, a keyboard, one or more diskette drives, internal fixed-disk storage, and an optional printer. PCs are designed primarily to give independent computing power to a single user and are inexpensively priced for purchase by individuals or small businesses. Examples include the various models of the IBM Personal Computers. plug. (1) A connector for attaching wires from a device to a cable, such as a store loop. A plug is inserted into a receptacle or plug. (2) To insert a connector into a receptacle or socket. Plug and Play (PnP). Pertaining to the capability of a hardware or software component to be installed on a system with minimal effort and to be available for use immediately thereafter. PnP. See Plug and Play. point-of-sale (POS). A method of providing information to support sales and of collecting the resulting sales information from retail devices located in stores. Glossary 133
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