IBM 4846-545 Service Guide - Page 186

input/output

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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, 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. LED. Light-emitting diode. light-emitting diode (LED). A semiconductor chip that gives off visible or infared light when activated. 164 Models 545 and 565 Hardware Service Guide 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 machines 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.

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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,
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.
LED.
Light-emitting
diode.
light-emitting
diode
(LED).
A
semiconductor
chip
that
gives
off
visible
or
infared
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
machines
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.
164
Models
545
and
565
Hardware
Service
Guide