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`The Ultimate Computer Reference
`
`© The Comprehensive Standard for
`comm
`Business, School, Library, and Home
`Included
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`E M
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`i osoft Press
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`99 puter
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`TI
`Ionary
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`Ition
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`° Over 300 illustrations and diagrams
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`- Extensive Internet coverage
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`0 Featured in Microsoft ‘1'“ Bookshelf
`- Covers software, hardware, concepts,
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`and more!
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`Microsoft Press
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`Computer
`Iblctmlmry
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`Third Edition
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`Microsoft?ress
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`PUBLISHED BY
`Microsoft Press
`A Division of Microsoft Corporation
`One Microsoft Way
`Redmond, Washington 98052—6399
`
`Copyright © I997 by Microsoft Corporation
`All rights reserved. No part of the contents of this book may be reproduced or transmitted
`in any form or by any means without the written permission of the publisher.
`
`Library of Congress Cataloging-in—Publication Data
`Microsoft Press Computer Dictionary. -- 3rd ed.
`p.
`cm.
`ISBN 1-5723I-446—X
`l. Computers-Dictionaries.
`I. Microsoft Press.
`
`2. Microcomputcrs——Dictionaries.
`
`QA?6.15.M54 I997
`OU4'.O3——dc21
`
`97-‘l5489CIP
`
`Robert Lyon, Roslyn Lutsch
`
`Macintosh, Power Macintosh, QuickTime, and TrueType are registered trademarks of Apple Computer,
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`registered trademarks and ActiveMovie, ActiveX, and Visual J++ are trademarks of Microsoft
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`mentioned herein may be the trademarks of their respective owners.
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`Printed and bound in the United States of America.
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`23456789 QMQM 210987
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`Distributed to the book trade in Canada by Macmillan of Canada, a division of Canada Publishing
`Corporation.
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`A CIP catalogue record for this book is available from the British Library.
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`Microsoft Press books are available through booksellers and distributors worldwide. For further
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`Contents '-_r..'
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`Introduction
`I"
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`IDictioImry
`of Computer Terms
`I
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`Apple Macintosh Extended Character Set
`524
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`ASCII Character Set
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`520
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`IBM Extended Character Set
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`522
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`EBCDIC Character Set
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`'
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`52::
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`Numeric Equivalents
`5:34
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`such a card consists of conventional static RAM
`
`chips powered by a small battery and is designed
`to provide additional RAM to the system. See also
`PC Card. Compare flash memory.
`p—code \P’kod\ rt. Seepseudocode,
`PCT \l"C—"l”\
`rt. Acronym for program compre-
`bension tool. A software engineering tool
`that
`facilitates the process of understanding the struc—
`ture andr'or functionality of computer programs.
`.pcx \dot—P‘C—X’\ n, The file extension that identi—
`fies bittnapped images in the PC Paintbrush file
`format.
`PC/X'I'
`\l"C—X—T‘\ n. The original TBM Personal
`Computer,
`introduced in 1981, which used the
`lntel 8088 CPU. See also lBM PC,
`
`PC/XT keyboard \P‘C—X—T' ke‘borcb n. The orig—
`inal keyboard for the TBM Personal Computer,
`Strong, reliable, and equipped with 83 keys, the
`l’C/X‘l‘ keyboard offers a typist an audible click.
`See the illustration. See also IBM PC, PC/XT.
`PDA \P‘D—A‘\ n. Acronym for Personal Digital
`Assistant.
`A
`lightweight
`palmtop
`computer
`designed to provide specific functions like personal
`organization (calendar, note taking, database, cal—
`culator, and so on) as well as communications.
`More advanced models also offer multimedia fea~
`
`tures. Many PDA devices rely on a pen or other
`pointing device for input instead of a keyboard or
`mouse, although some offer a keyboard too small
`for touch typing to use in conjunction widt a pen
`or pointing device. For data storage, a PDA relies
`on tlash memory instead of power—hungry disk
`drives, See also firmware, flash memory, PC Card.
`pen computer.
`PDC \P‘D—C’\ n, .S‘ee Primary Domain Controller.
`
`'31. 399 PC
`
`time, depending on the in'iplernentation, and it
`allows intelligent, PCl—compliant adapters to per—
`form tasks concurrently with the CPU using a tech—
`nique called bus mastering. The PCI specification
`allows for multiplexing, a technique that permits
`more than one electrical signal to be present on
`the bus at one time,
`.S‘ee also local bus. Compare
`V L bus.
`it. See Printer Control Language.
`PCL \lJ‘C~L'\
`PCM \P‘C—M’\
`it. See pulse code modulation.
`PCMCIA \l"C—M‘C—l—A‘\ n. Acronym for Personal
`Computer Memory Card International Association.
`A group of manufacturers and vendors formed to
`promote a common standard for PC Card—based
`peripherals and the slot designed to hold them,
`primarily on laptop, palmtop, and other portable
`computers, as well as for intelligent electronic
`devices. l’CMClA is also the name of the standard
`for PC Cards, first introduced in 1990 as release 1.
`See also PC Card, PCMCIA slot.
`PCMCIA Card \P‘C—MTZ—l—A' katd‘\
`card.
`PCMCIA connector \P‘C—M‘C—l-A’ ko—nek‘tor\ n.
`The 68—pin female connector inside a PCMCLA slot
`designed to hold the 68—pin male connector on a
`PC (lard. See also PC Card, PCMCIA slot.
`PCMCIA slot \P‘C—M‘C—l—A' slot‘\
`in. An opening
`in the housing of a computer, peripheral, or other
`intelligent electronic device designed to hold a PC
`Card. Also called PC Card slot. See also PC Card,
`PCMCIA ct‘mnector.
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`
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`PC memory card \IJ—C‘ mem’or—E kard‘\ rt, 1. An
`add—in circuit card that increases the amount of
`RAM in a system. See also memory card. 2. A 'l'ype
`1 PC Card as specified by PCMCIA. In this context,
`
`
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`PC/XT keyboard.
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