IBM 4851 514 Service Guide - Page 147
input/output
View all IBM 4851 514 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 147 highlights
Updated October, 2008 DVD-ROM. Digital-video-disk read-only memory. E error message. A message that is issued because an error has been detected. F FCC. See Federal Communications Commission. feature. A part of an IBM product that may be ordered separately by the customer. Federal Communications Commission (FCC). A board of commissioners appointed by the President under the Communications Act of 1934, having the power to regulate all interstate and foreign communications by wire and radio originating in the United States. field. On a data medium or a storage medium, a specified area used for a particular category of data; for example, a group of character positions used to enter or display wage rates on a panel. (T) file. A named set of records stored or processed as a unit. (T) For example, an invoice may form a record and the complete set of such records may form a file. See also data set. flash memory. A data-storage device that is programmable, erasable, and does not require continuous power. The chief benefit of flash memory over other programmable and erasable data storage devices is that it can be reprogrammed wihtout being removed from the circuit board. formatted diskette. A diskette on which track and sector control information has been written and that can be used by the computer to store data. Note: A diskette must be formatted before it can receive data. frame . (1) The unit of transmission in some LANs, including the IBM Token-Ring Network and the IBM PC Network. It includes delimiters, control characters, information, and checking characters. On a token-ring network, a frame is created from a token when the token has data appended to it. On a token-bus network (IBM PC Network), all frames including the token frame contain a preamble, start delimiter, control address, optional data and checking characters, end delimiter, and are followed by a minimum silence period. (2) A housing for machine elements. (3) In synchronous data link control (SDLC), the vehicle for every command, every response, and all information that is transmitted using SDLC procedures. Each frame begins and ends with a flag. function. (1) A specific purpose of an entity, or its characteristic action. (A) (2) In data communications, a machine action such as a carriage return or line feed. (A) G gigabyte. Approximately one billion bytes or 1,024 megabytes. Gigabyte is often abbreviated as G or GB. H hard-disk drive. In a personal computer system unit, a disk storage device that reads and writes on rigid magnetic disks. It is faster and has a larger storage capacity than a diskette and is permanently installed. Synonymous with fixed disk. HID. See human interface devices. hot pluggable. Refers to a hardware component that can be installed or removed without disturbing the operation of any other resource that is not connected to, or dependent on, this component. human interface devices (HID). Devices which allow humans to interact and communicate with a computer. Examples are a keyboard or a mouse. hot plugging. Process of installing connections to the serial bus while the system is running and without powering down. hot unplugging. Process of removing connections from the serial bus while the system is running and without powering down. hypertext. (1) A method of presenting text in discrete units, or nodes, that are connected by links for navigation. (2) Text designed to be read or accessed in a nonlinear manner using nodes that are connected by links for navigation. I I/O. See input/output. I/O device. A device in a data processing system by means of which data can be entered into the system, received from the system, or both. (I) (A) IBM Disk Operating System (DOS) . A disk operating system based on MS-DOS that operates with all IBM-compatible personal computers. IEEE. Institute of Electrical and Electronics Engineers. input/output (I/O). (1) Pertaining to a device whose parts can perform an input process and an output process at the same time. (I) (2) Pertaining to a functional unit or channel involved in an input process, Glossary 131