IBM Models 5, Service Manual

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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,
output process, or both, concurrently or not, and to the
data involved in such a process.
integrated. Arranged together as one unit.
interference. (1) The prevention of clear reception of
broadcast signals. (2) The distorted portion of a
received signal.
interrupt. (1) A suspension of a process, such as
execution of a computer program, caused by an
external event and performed in such a way that the
process can be resumed. (A) (2) To stop a process in
such a way that it can be resumed. (3) A means of
passing processing control from one software or
microcode module or routine to another, or of
requesting a particular software, microcode, or
hardware function.
J
jabber.
Transmission by a data station beyond the
time interval allowed by the protocol. (T)
K
K. When referring to storage capacity, a symbol that
represents two to the tenth power, or 1024.
keyboard. A group of numeric keys, alphabetic keys,
special character keys, or function keys used for
entering information into the terminal and into the
system.
L
LAN. See local area network .
LAN adapter. The circuit card within a
communicating device (such as a personal computer)
that, together with its associated software, enables the
device to be attached to a LAN.
LCD. Liquid crystal display
LED. Light-emitting diode.
light-emitting diode (LED). A semiconductor chip
that gives off visible or infrared light when activated.
line. On a terminal, one or more characters entered
before a return to the first printing or display position.
link. (1) The logical connection between nodes
including the end-to-end link control procedures. (2)
The combination of physical media, protocols, and
programming that connects devices on a network. (3)
In computer programming, the part of a program, in
some cases a single instruction or an address, that
passes control and parameters between separate
portions of the computer program. (4) To interconnect
items of data or portions of one or more computer
programs. (5) In SNA, the combination of the link
connection and link stations joining network nodes. See
also
link connection . Note: A link connection is the
physical medium of transmission; for example, a
telephone wire or a microwave beam. A link includes
the physical medium of transmission, the protocol, and
associated devices and programming; it is both logical
and physical.
link connection. (1) All physical components and
protocol system s that lie between the communicating
link stations of a link. The link connection may include
a switched or leased physical data circuit, a LAN, or an
X.25 virtual circuit. (2) In SNA, the physical equipment
providing two-way communication and error correction
and detection between one link station and one or
more other link stations. (3) In the IBM Store System,
the logical link providing two-way communication of
data from one network node to one or more other
network nodes.
load. In computer programming, to enter data into
memory or working registers.
local area network (LAN). A computer network
located on a user’s premises within a limited
geographical area.
Note: Communication within a LAN
is not subject to external regulations; however,
communication across the LAN boundary may be
subject to some form of regulation.
logon. The procedure for starting up a point-of-sale
terminal or store controller for normal sales operations
by sequentially entering the correct security number
and transaction number. Synonymous with
sign-on .
M
magnetic ink character reader (MICR). An input unit
that reads characters by magnetic ink character
recognition. (A)
magnetic ink character recognition. (1) MICR.
Character recognition of magnetic ink characters. (T) (2)
The identification of characters through the use of
magnetic ink.
MB. See megabyte .
Mbps. One million bits per second.
megabyte (MB) . A unit of measure for data. 1
megabyte = 1 048 576 bytes.
memory. Program-addressable storage from which
instructions and other data can be loaded directly into
registers for subsequent execution or processing.
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