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Z

Word Explanation
Z force

A touch screen's sensitivity to pressure.

Z Object Publishing Environment

(ZOPE). A free, open-source web application platform used for building high-performance, dynamic Web sites.

Z shell

(zsh). A UNIX command interpreter.

z-axis

The third dimension (depth), in a three-dimensional coordinate system. The x-axis is the width and the y-axis is the height.

z-fold paper

Continuous paper with holes on the edges, folded like a "z" with each page folded the opposite direction of the page before. It is used in tractor-feed dot matrix printers; after printing, the pages are separated along the perforations and the edge strips are torn off.

Z-mail

A commercial mail user agent for MS-DOS and Unix.

Z3

An early computer from the 1940s.

Z39.50

An ANSI (American National Standards Institute) search and retrieval protocol used by WAIS (Wide Area Information Service).

Z80

An 8-bit microprocessor from Zilog with a clock speed of 2 MHz, used in many personal computers with the CP/M operating system.

Z8000

A 16-bit microprocessor from Zilog Corporation.

zap
  1. To hit with a sudden, concentrated force. The expression probably originates from comic books where characters are "zapped" with lasers, electricity, or other forces, sometimes even magical forces. Zapping is indicated by a balloon with jagged lines around it and the word ZAP! in big letters. 2. When things get zapped in comic books they often are killed or destroyed; but in computer jargon, zapping can refer to various processes used to fix things. For example, to "zap the PRAM" means to reset it.
ZBR

Zone Bit Recording (also called zone constant angular velocity). Ordinarily, data is recorded on a magnetic disk on concentric tracks that each hold the same number of bits. When the disk rotates at constant speed (constant angular velocity), the tracks near the periphery of the disk move faster than the tracks near the center. Therefore, the outside tracks must be physically larger in order to hold the same amount of data as the inner tracks; they also have less recording density. Zone bit recording is a method of storing data on a disk in which the disk rotates at constant angular velocity, but the outer tracks can have higher recording density than on a conventional disk, thus making it possible to store more data. This is achieved by dividing the disk into concentric zones and changing the clock rate as the read/write head moves from one zone to another.

ZCAV

(Zone Constant Angular Velocity; also called zone bit recording). Ordinarily, data is recorded on a magnetic disk on concentric tracks that each hold the same number of bits. When the disk rotates at constant speed (constant angular velocity), the tracks near the periphery of the disk move faster than the tracks near the center. Therefore, the outside tracks must be physically larger in order to hold the same amount of data as the inner tracks; they also have less recording density. Zone constant angular velocity is a method of storing data on a disk in which the disk rotates at constant angular velocity, but the outer tracks can have higher recording density than on a conventional disk, thus making it possible to store more data. This is achieved by dividing the disk into concentric zones and changing the clock rate as the read/write head moves from one zone to another.

ZD Net

An electronic information service provided by Ziff-Davis Interactive, which was formerly called ZiffNet. ZD Net has a large library of downloadable shareware and freeware, plus product reviews, computing advice, forums, and email. ZD Net includes the former PC Magnet and ZMac.

ZDBOp

Ziff-Davis Benchmark Operation. The division of Ziff-Davis, Inc. that develops the benchmark programs used by Ziff-Davis publications, including BatteryMark, BrowserComp, MacBench, NetBench, ServerBench, WebBench, WinBench, and Winstone.

ZDigit II

This device enables older notebooks with screens that turn off automatically when not in use to run the BatteryMark test by utilizing a motor and a lever to tap a keyboard key (preferably the spacebar) every 15 seconds. The BatteryMark test cannot perform its checks with an unlit notebook screen, hence the ZDigit II becomes important as it is continually taps a key to keep the screen from shutting down. NOTE: ZDigit II devices are only needed on old notebooks that do not have updated BIOS that allow them to keep their screens lit even when not in use.

ZDO: ZigBee Device Object

ZigBee Device Object (ZDO), a protocol in the ZigBee protocol stack, is responsible for overall device management, and security keys and policies. The ZDO is like a special application object that is resident on all ZigBee nodes. ZDO has its own profile, known as the ZigBee Device Profile (ZDP), which the application end points and other ZigBee nodes can access.

zepto-

The SI prefix meaning 10^-21.

zero

0; ASCII character 48. The arithmetic symbol for absence of quantity or magnitude.

Zero Insertion Force socket

(ZIF socket). A special socket for plugging in integrated circuits easily. The socket can be opened with a small lever or screw; the chip is dropped in, then the socket is closed.

zero out
  1. To set to zero. 2. To erase.
zero punch

In a Hollerith card, a punch that is in the third row from the top.

zero wait state

The execution of instructions or transfer of data with no delay (wait state) to allow time for slower memory chips or external devices to respond. See wait state.

zero-content

Having no content; refers to a communication that doesn't really communicate anything, such as a wordy speech that has no substance.

zerofill

To fill up empty storage locations with zeroes (0).

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