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O
offline Neither controlled by nor
communicating with a computer. (IBM)
online Pertaining to the operation of a
functional unit when under the direct control
of the computer. (T)
open systems A system whose
characteristics comply with standards made
available throughout the industry and that
therefore can be connected to other systems
complying with the same standards. (T)
In the 9840 Tape Drive System, a drive that
has a SCSI or fibre-optic interface.
operating system Software that controls
program execution.
operator control panel A functional unit
that contains switches used to control all or
part of a computer and possibly the
indicators giving information about its
functioning. (T)
P
performance One of two major factors,
together with facility, on which the total
productivity of a system depends.
Performance is largely determined by a
combination of throughput, response time,
and availability. (IBM)
port A specific communications end point
within a host. A port is identified by a port
number. (IBM)
protocol A set of semantic and syntactic
rules that determines the behavior of
functional units in achieving communication.
(I).
R
RAM See random access memory.
95739
random access memory (RAM) A storage
device in which data can be written and read.
(IBM).
read/write head The data sensing and
recording unit of a diskette magazine drive or
tape drive. (IBM)
reclaim In the 9840 Tape Drive System, the
process of reformatting a tape as a data tape.
release A distribution of a new product or
new function and fixes for an existing
product. (IBM)
resident Pertaining to computer programs
or data while they remain on a particular
storage device. (T)
restore To return a backup copy to the
active storage location for use. (IBM)
rewind To move tape from the take-up hub
to the supply hub. (IBM)
S
SCSI See Small Computer System Interface.
small computer system interface (SCSI)
An input and output bus that provides a
standard interface between the devices.
software All or part of the programs,
procedures, rules, and associated
documentation of a data processing system.
Software is an intellectual creation that is
independent of the medium on which it is
recorded. (T)
Solaris An operating system that runs on
SUN Microsystems and other workstations.
state The condition of a device, such as
online or offline.
sub-menu A menu related to and reached
from a main menu. (IBM)
switch A device or programming technique
for making a selection; for example, a toggle,
a conditional jump. (A)
Ninth Edition
Glossary
Glossary-5
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