Quick Reference Guide

330 Glossary
PCMCIA
Personal Computer Memory Card International Association. An international
trade association that has developed standards for devices, such as modems and
external hard drives, that can be plugged into portable computers.
PERC
Acronym for PowerEdge ™ Expandable RAID controller.
peripheral device
An internal or external device—such as a printer, a disk drive, or a keyboard—
connected to a system.
PGA
Abbreviation for pin grid array, a type of microprocessor socket that allows you to
remove the microprocessor chip.
physical memory array
The physical memory array is the entire physical memory of a system. Variables for
physical memory array include maximum size, total number of memory slots on
the motherboard, and total number of slots in use.
physical memory array mapped
The physical memory array mapped refers to the way physical memory is divided.
For example, one mapped area may have 640 KB and the other mapped area may
have between 1 MB and 127 MB.
PIC
Acronym for programmable interrupt controller.
PIP
Acronym for peripheral interchange program.
pixel
A single point on a video display. Pixels are arranged in rows and columns to create
an image. A video resolution, such as 640 x 480, is expressed as the number of
pixels across by the number of pixels up and down.
PKCS #7
Abbreviation for Public Key Cryptography Standard #7. PKCS #7 is an RSA Data
Security, Inc., standard for encapsulating signed data such as a certificate chain.