IBM 4846-545 Service Guide - Page 184

diagnostic

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network for the purpose of sharing resources and communicating with each other. collision. (1) An unwanted condition that results from concurrent transmissions on a channel. (T) (2) When a frame from a transmitting adapter encounters any other signal in its path (frame, noise, or another type of signal), the adapter stops transmitting and a collision is registered. command. (1) A request for performance of an operation or execution of a program. (2) A character string from a source external to a system that represents a request for system action. component. (1) Any part of a network other than an attaching device, such as an IBM 8228 Multistation Access Unit. (2) Hardware or software that is part of a functional unit. configuration. (1) The devices and programs that make up a system, subsystem, or network. (A) See also system configuration. (2) In the IBM StorePlace Distributed Data Services for OS/2, program options that are initially set at installation, and that can be changed later. Changing these options requires an IPL. These changes must be performed by a programmer or store operations personnel. These options are used to tune the product's use of the operating system and machine resources. connect. In a LAN, to physically join a cable from a station to an access unit or network connection point. Contrast with attach. controller. A unit that controls input/output operations for one or more devices. cursor. A movable point of light (or a short line) that indicates where the next character is to be entered on the display screen. D data. (1) A representation of facts, concepts, or instructions in a formalized manner suitable for communication, interpretation, or processing by human or automatic means. (I) (A) (2) Any representations such as characters or analog quantities to which meaning is or might be assigned. (A) data file. A collection of related data records organized in a specific manner; for example, a payroll file (one record for each employee, showing such information as rate of pay and deductions) or an inventory file (one record for each inventory item, showing such information as cost, selling price, and number in stock.) See also data set, file. data processing system. A system, including computer systems and associated personnel, that 162 Models 545 and 565 Hardware Service Guide performs input, processing, storage, output, and control functions to accomplish a sequence of operations on data. (A) (I) data set. Logically related records treated as a single unit. See also file. DBCS. See double-byte character set. device. (1) A mechanical, electrical, or electronic contrivance with a specific purpose. (2) An input/output unit such as a terminal, display, or printer. See also attaching device. diagnostic diskette. A diskette containing diagnostic modules or tests used by computer users and service personnel to diagnose hardware problems. diagnostics. Modules or tests used by computer users and service personnel to diagnose hardware problems. digital. (1) Pertaining to data in the form of digits. (A) Contrast with analog. (2) Pertaining to data consisting of numerical values or discrete units. DIP switch. A two-position switch on a circuit board that is preset to control certain functions. The user can change the position of a DIP switch to satisfy special requirements. disk. A round, flat, data medium that is rotated in order to read or write data. (T) See also diskette, hard-disk drive. disk operating system (DOS). A computer operating system that can perform only one task at a time. diskette. A thin, flexible magnetic disk permanently enclosed in a protective jacket. A diskette is used to store information for processing. diskette drive. The mechanism used to seek, read, and write data on diskettes. display. (1) A visual presentation of data. (2) A device that presents visual information to the point-of-sale terminal operator and to the customer. distributed. Physically separate but connected by cables. DOS. See disk operating system. double-byte character set (DBCS). A set of characters in which each character is represented by 2 bytes. Languages such as Japanese, Chinese, and Korean, which contain more symbols than can be represented by 256 code points, require double-byte character sets. Because each character requires 2 bytes, the typing, display, and printing of DBCS characters requires hardware and programs that support DBCS. Contrast with single-byte character set. DRAM. Dynamic RAM. See RAM.

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network
for
the
purpose
of
sharing
resources
and
communicating
with
each
other.
collision.
(1)
An
unwanted
condition
that
results
from
concurrent
transmissions
on
a
channel.
(T)
(2)
When
a
frame
from
a
transmitting
adapter
encounters
any
other
signal
in
its
path
(frame,
noise,
or
another
type
of
signal),
the
adapter
stops
transmitting
and
a
collision
is
registered.
command.
(1)
A
request
for
performance
of
an
operation
or
execution
of
a
program.
(2)
A
character
string
from
a
source
external
to
a
system
that
represents
a
request
for
system
action.
component.
(1)
Any
part
of
a
network
other
than
an
attaching
device,
such
as
an
IBM
8228
Multistation
Access
Unit.
(2)
Hardware
or
software
that
is
part
of
a
functional
unit.
configuration.
(1)
The
devices
and
programs
that
make
up
a
system,
subsystem,
or
network.
(A)
See
also
system
configuration
.
(2)
In
the
IBM
StorePlace
Distributed
Data
Services
for
OS/2,
program
options
that
are
initially
set
at
installation,
and
that
can
be
changed
later.
Changing
these
options
requires
an
IPL.
These
changes
must
be
performed
by
a
programmer
or
store
operations
personnel.
These
options
are
used
to
tune
the
product’s
use
of
the
operating
system
and
machine
resources.
connect.
In
a
LAN,
to
physically
join
a
cable
from
a
station
to
an
access
unit
or
network
connection
point.
Contrast
with
attach
.
controller.
A
unit
that
controls
input/output
operations
for
one
or
more
devices.
cursor.
A
movable
point
of
light
(or
a
short
line)
that
indicates
where
the
next
character
is
to
be
entered
on
the
display
screen.
D
data.
(1)
A
representation
of
facts,
concepts,
or
instructions
in
a
formalized
manner
suitable
for
communication,
interpretation,
or
processing
by
human
or
automatic
means.
(I)
(A)
(2)
Any
representations
such
as
characters
or
analog
quantities
to
which
meaning
is
or
might
be
assigned.
(A)
data
file.
A
collection
of
related
data
records
organized
in
a
specific
manner;
for
example,
a
payroll
file
(one
record
for
each
employee,
showing
such
information
as
rate
of
pay
and
deductions)
or
an
inventory
file
(one
record
for
each
inventory
item,
showing
such
information
as
cost,
selling
price,
and
number
in
stock.)
See
also
data
set,
file
.
data
processing
system.
A
system,
including
computer
systems
and
associated
personnel,
that
performs
input,
processing,
storage,
output,
and
control
functions
to
accomplish
a
sequence
of
operations
on
data.
(A)
(I)
data
set.
Logically
related
records
treated
as
a
single
unit.
See
also
file
.
DBCS.
See
double-byte
character
set
.
device.
(1)
A
mechanical,
electrical,
or
electronic
contrivance
with
a
specific
purpose.
(2)
An
input/output
unit
such
as
a
terminal,
display,
or
printer.
See
also
attaching
device
.
diagnostic
diskette.
A
diskette
containing
diagnostic
modules
or
tests
used
by
computer
users
and
service
personnel
to
diagnose
hardware
problems.
diagnostics.
Modules
or
tests
used
by
computer
users
and
service
personnel
to
diagnose
hardware
problems.
digital.
(1)
Pertaining
to
data
in
the
form
of
digits.
(A)
Contrast
with
analog
.
(2)
Pertaining
to
data
consisting
of
numerical
values
or
discrete
units.
DIP
switch.
A
two-position
switch
on
a
circuit
board
that
is
preset
to
control
certain
functions.
The
user
can
change
the
position
of
a
DIP
switch
to
satisfy
special
requirements.
disk.
A
round,
flat,
data
medium
that
is
rotated
in
order
to
read
or
write
data.
(T)
See
also
diskette,
hard-disk
drive
.
disk
operating
system
(DOS).
A
computer
operating
system
that
can
perform
only
one
task
at
a
time.
diskette.
A
thin,
flexible
magnetic
disk
permanently
enclosed
in
a
protective
jacket.
A
diskette
is
used
to
store
information
for
processing.
diskette
drive.
The
mechanism
used
to
seek,
read,
and
write
data
on
diskettes.
display.
(1)
A
visual
presentation
of
data.
(2)
A
device
that
presents
visual
information
to
the
point-of-sale
terminal
operator
and
to
the
customer.
distributed.
Physically
separate
but
connected
by
cables.
DOS.
See
disk
operating
system
.
double-byte
character
set
(DBCS).
A
set
of
characters
in
which
each
character
is
represented
by
2
bytes.
Languages
such
as
Japanese,
Chinese,
and
Korean,
which
contain
more
symbols
than
can
be
represented
by
256
code
points,
require
double-byte
character
sets.
Because
each
character
requires
2
bytes,
the
typing,
display,
and
printing
of
DBCS
characters
requires
hardware
and
programs
that
support
DBCS.
Contrast
with
single-byte
character
set
.
DRAM.
Dynamic
RAM.
See
RAM
.
162
Models
545
and
565
Hardware
Service
Guide