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There are 60 names in this directory beginning with the letter Z.
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.

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).

zeroize

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

zeroth

First, in an enumeration that begins with zero. Zero-based numbering is often used in computer programming.

zetta-

The SI prefix for 10^21; or, in binary, 2^70 = 1,180,591,620,717,411,303,424.

zettabyte

2^70 = 1,180,591,620,717,411,303,424 bytes, which is 1024 exabytes.

ZIF socket

Zero Insertion Force 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.

Ziff-Davis Benchmark Operation

(ZDBOp). 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.

Ziff-Davis, Inc.

The publisher of well-known computer magazines including MacUser, MacWeek, PC Magazine, PC/Computing, and PC Week. Ziff-Davis also has an online service called ZD Net (formerly ZiffNet).

ZiffNet

(Now called ZD Net). An electronic information service provided by Ziff-Davis Interactive, which has a large library of downloadable shareware and freeware, plus product reviews, computing advice, forums, and email.

zigzag-fold paper

Continuous paper with holes on the edges, folded in zigzag fashion 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.

ZIL

Zork Implementation Language. A programming language used for Infocom games.

Zilog

A microprocessor manufacturer.

zinc air

A rechargeable battery that is more efficient than the older nickel cadmium and nickel metal hydride batteries, and does not have memory effects. See nickel cadmium and nickel metal hydride.

zine

An online magazine, also called ezine or e-zine, for electronic magazine.

zip

To compress a file using PKZIP, ZipIt, gzip, or other compatible archiver.

Zip disk

A 3.5″ removable cartridge used with the Iomega Zip drive. Zip disks can store 25MB or 100MB, and are used to back up data or transfer data from one computer to another.

Zip drive

A small, lightweight, portable disk drive from Iomega, which uses 100-megabyte 3.5″ removable cartridges.

zip file

A file which has been compressed with PKZIP or compatible software. Zip files are indicated by the .ZIP filename extension, and can be unpacked with PKUNZIP or UnZip.

zipperhead

A person who has a closed mind. This expression is said to have originated at IBM.

Zmodem

A file transfer protocol which transmits data between modems in blocks of 512 bytes. It is fast because it does not wait for positive acknowledgement (ACK) after each block of data, but will resend a block if it receives a negative acknowledgement (NAK). If a file transfer is interrupted, Zmodem can resume the transfer later and send only the part of the file that was not yet sent, which can save a lot of time. Zmodem is an advancement over Xmodem and Ymodem.

zone bit recording

(ZBR; 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.

zone constant angular velocity

(ZCAV; 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.

Zoo

A compression program for UNIX, DOS, and other platforms, available as freeware.

zoom

A feature in many applications that allows the user to magnify a small area of the file (as if moving in closer: zoom in) or view more of the page with less detail (as if moving farther away: zoom out). The amount of zoom is usually shown as a percentage (25% size, 200% size) or ratio (2:1 means magnified to twice normal size; 1:2 means reduced to 1/2 size).

zoom box

A little box in the upper right corner of the window in a Macintosh file. Clicking once on the zoom box will make the window enlarge to full size; clicking again will make the window return to its smaller size. The Windows equivalent is the Maximize and Restore commands.

zoom in

A feature in many applications that allows the user to magnify a small area of the file, as if moving in closer. The amount of zoom is usually shown as a percentage (200% size) or ratio (for example, 2:1 means twice normal size).

zoom out

A feature in many applications that allows the user to view more of the page with less detail, as if moving farther away. The amount of zoom is usually shown as a percentage (25% size, 50% size) or ratio (for example, 1:2 means reduced to 1/2 size).

Zoomer

A personal digital assistant from Casio.

ZOPE

Z Object Publishing Environment. A free, open source Web application platform used for building high-performance, dynamic Web sites.

Zork

An early computer fantasy game which was the basis for The Zork Trilogy (from Infocom) and the game Dungeon.

Zork Implementation Language

(ZIL). A programming language used for Infocom games.

zorkmid

A unit of currency in Zork and now in some other computer fantasy games.

zsh

Z shell. A UNIX command interpreter.

Zterm

A Macintosh shareware program that provides terminal emulation, ANSI support, and a phonebook. It was the first Mac program to provide Zmodem FTP, and also supports Xmodem and Ymodem.

Zworykin, Vladimir K.

A Russian-born American (1889-1982) who is called the father of television. He patented the iconoscope, predecessor of the television camera, and the kinoscope, which became the television tube. He demonstrated the first practical model of a television in 1938.

Zydeco

A Java-based browser and development environment for XML.

ZyXEL

A modem manufacturer in Anaheim, California.

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