P
R
pack . Two or more hard disks interconnected to
increase security, performance, or reliability. Commonly
RAID . Redundant array of independent disks.
referred to as a disk array.
RAM . Random access memory.
packet . In data communication, a sequence of binary
digits, including data and control signals, that is
random access memory (RAM) . (1) A storage device
transmitted and switched as a composite whole. The
in which data can be written and read. (2) A stor
data, control signals, and possibly error control
device into which data is written and from which
information are arranged in a specific format. (I)
read in a nonsequential manner.
parallel port . An access point through which a RAS . Reliability, availability, and serviceability. computer transmits or receives data that consists of
several bits sent simultaneously on separate readwires. . To acquire or interpret data from a storag
Contrast with serial port.device, from a data medium, or from another sourc
prompt . A visual or audible message sent by a program to request the user's response. (T)
operating system . Software that controls the
execution of programs and that may provide services
program . (1) A sequence of instructions that a
such as resource allocation, scheduling, input/output
computer can interpret and execute. (2) To design, control, and data management. Although operatingwrite, modify, and test computer programs. (I) (A) systems are predominantly software, partial hardware
implementations are possible. (T)
O
ODI . Open-Data Link Interface.
processor . A functional unit that interprets and executes instructions. A processor consists of at l an instruction control unit and an arithmetic and log unit. (T) See microprocessor and central processing unit.

PCI .

 

Peripheral

component

interconnect.

 

 

read-only

memory

(ROM)

 

 

.

Memory

in

which

stored

 

 

 

performance

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

data

cannot

be

modified

by

 

the

user

except

 

und

 

.

One

of

the

two

major

factors,

together

 

 

 

 

 

 

also EEPROM, EPROM,

and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

special

conditions. See

 

 

 

 

with

facility,

on

which

the

total

productivity

of

a

 

system

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PROM.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

depends. Performance is largely determined by a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

combination of throughput, response time, and

record .

(1) A

set

of

data

treated

as

a

unit. (

availability.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of

one

or more related data items grouped for

physical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

processing.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

.

(1) Pertaining

to

 

actual

 

implementation

or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

location as

opposed

to

conceptual

 

content

or

meaning.

 

(1) To

recharge

a

memory

location

in

volati

(A)

(2) Contrast

with

logical.

(A)

 

 

 

 

 

refresh .

 

 

 

 

 

 

memory

with

an

electric

current

so

that

it

retains

pin .

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

or

binary

value.

(2) In

computer

graphics,

the

proc

 

One

of

the

conducting

contacts

of

an

electrical

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connector.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of repeatedly producing a display image on a dis

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

surface

 

so

that

the

image

remains

visible.

 

 

 

port .

An

access

point

for

data

entry

or exit. (Contrast

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

with

connector.)

 

 

 

 

 

 

 

 

 

 

 

 

register .

 

 

(1) An integrated circuit that contains 8,

 

 

 

 

 

 

 

 

 

 

 

 

or

32

storage locations, each of which can store

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

binary

 

data. See

also

binary.

(2) An

area

that

 

sto

POST .

Power-on

self-test.

 

 

 

 

 

 

 

 

binary

 

data

while

it

is

being

processed

by

the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

power-on

self-test

(POST) .

A

series

of

 

 

 

repeater .

 

 

A

device

used

to

amplify or

reshape

si

diagnostic

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tests

that

are

run

automatically

by

a

 

device

when

.

the

 

video monitors,

 

a

measure

of

the

 

power

is

turned

on.

 

 

 

 

 

 

 

 

 

 

resolution

 

 

In

 

 

 

 

 

 

 

 

 

 

 

 

sharpness

 

of

an

image,

expressed

as

the

number

o

processing

.

The

performance

of logical

 

 

lines

and

 

columns

on

the

monitor

screen

or the

numbe

operations

 

 

per

unit

of

area.

 

 

 

 

 

 

 

 

 

 

and

calculations

on

data,

including

 

temporary

of

pels

 

 

 

 

 

 

 

 

 

 

 

 

retention

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of

data

in

microprocessor

 

storage

while

the

data

is

 

 

 

memory.

 

 

 

 

 

 

 

 

 

 

 

being

operated

on.

 

 

 

 

 

 

 

 

 

 

ROM .

 

Read-only

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Glossary 181

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IBM 5000 manual Pci