IBM 6151 Maintenance And Service Manual page 748

without intervention by a human operator
during a run.
configuration. (1) The arrangement of a
computer system or network as defined by
the nature, number, and the chief
characteristics of its functional units.
More specifically, the term configuration
may refer to a hardware configuration or
a software configuration. (2) The devices
and programs that make up a system,
subsystem, or network.
cps. See characters per second.
cursor. (1) A movable symbol (such as
an underline) on a display, used to
indicate to the operator where the next
typed character will be placed or where
the next action will be directed. (2) A
marker that indicates the current data
access location within a file.
data. (1) A representation of facts,
concepts, or instructions in a formalized
manner suitable for communication,
interpretation, or processing by human or
automatic means. (2) Any
representations, such as characters or
analog quantities, to which meaning is, or
might be assigned.
direct memory access (DMA). A
method of transferring data between main
storage and I/O devices that does not
require processor intervention.
disk drive. The same as fixed disk drive.
diskette. A thin, flexible magnetic plate
that is permanently sealed in a protective
X-2 Service Manual
cover. It can be used to store information
copies from the disk or another diskette.
diskette drive. A mechanism used to
read and write information on diskettes.
display. (1) A device for visual
presentation of information. (2) To
present data visually.
DMA. See direct memory access.
duplex. Pertains to communications data
that can be sent and received at the same
time. Same as full duplex.
ECC. See error-checking and correction.
error-checking and correction (ECC).
The detection, in the processing unit, and
correction of all single-bit errors, plus the
detection of double-bit and some
multiple-bit errors.
F. See fahrenheit.
Fahrenheit (F). A temperature scale.
Contrast with Celsius (C).
FCC. Federal Communications
Commission.
field-replaceable unit (FRU). Parts or
devices that can be replaced during the
normal servicing of the equipment.
fixed-disk drive. A mechanism used to
read and write information on fixed disk.
format. (1) A defined arrangement of
such things as characters, fields, and
lines, usually used for displays, printouts,