IBM 5531 Operator's Manual page 184

reverse video. A form of highlighting a character, field, or
cursor by reversing the color of the character, field, or cursor
with its background; for example, changing a red character on
a black background to a black character on a red background.
RF. Radio frequency.
RF modulator. The device used to convert the composite video
signal to the antenna level-input of a home TV.
ROM. Read-only memory.
ROM/BIOS. The ROM resident basic input/output system,
which provides the level control of the major I/O devices in the
computer system.
run. A single continuous performance of a computer program
or routine.
schematic. The representation, usually in a drawing or diagram
form, of a logical or physical structure.
SOLC. Synchronous Data Link Control.
sector. That part of a track or band on a magnetic drum, a
magnetic disk, or a disk pack that can be accessed by the
magnetic heads in the course of a predetermined rotational
displacement of the particular device.
setup. In a computer that consists of an assembly of individual
computing units, the arrangement of interconnections between
the units, and the adjustments needed for the computer to
operate. The preparation of a computing system to perform a
job or job step. Setup is usually performed by an operator and
often involves performing routine functions, such as mounting
tape reels. The preparation of the system for normal operation.
signal. A variation of a physical quantity, used to convey data.
software. Computer programs, procedures, and rules
concerned with the operation of a data-processing system.
Contrast with hardware.
storage. A storage device. A device, or part of a device, that
can retain data. The retention of data in a storage device. The
placement of data into a storage device.
Synchronous Data Link Control (SOLC). A protocol for
management of data transfer over a data link.
synchronous transmission. Data transmission in which the time
of occurrence of each signal representing a bit is related to a
fixed time frame. Data transmission in which the sending and
receiving devices are operating continuously at substantially the
same frequency and are maintained, by means of correction, in a
desired phase relationship.
syntax. The relationship among characters or groups of
characters, independent of their meaning'S or the manner of their
interpretation and use. The structure of expressions in a
language. The rules governing the structure of a
language. The relationships among symbols.
text. In ASCII and data communication, a sequence of
characters treated as an entity if preceded and terminated by
one start-of-text and one end-of-text transmission control
character, respectively.
track. The path or one of the set of paths, parallel to the
reference edge on a data medium, associated with a single
reading or writing component as the data medium moves past
the component. The portion of a moving data medium such as a
drum, or disk, that is accessible to a given reading head position.
translate. To transform data from one language to another.
transmission. The sending of data from one place for reception
elsewhere. In ASCII and data communication, a series of
characters including headings and text. The dispatching of a
signal, message, or other form of intelligence by wire, radio,
telephone, or other means. One or more blocks or
messages. For SSC and start-stop devices, a transmission is
terminated by an EOT character. Synonymous with data
transmission.
typematic. Keyboard buttons that will repeat when held
depressed.
video. Computer data or graphics displayed on a cathode ray
tube, monitor, or display.
word. A character string or a bit string considered as an
entity. See computer word.
write. To make a permanent or transient recording of data in a
storage device or on a data medium.
Terms and Abbreviations
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