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ZCS
See zero code suppression.

zero code suppression (ZCS)
A coding method used with alternate mark inversion to prevent sending eight successive zeros. If eight successive zeros occur, the second-least significant bit (bit 7, with the bits labeled 1 through 8 from the most significant to the least significant) is changed from a 0 to a 1. AMI with ZCS does not support clear channel operation.

zero suppression
The substitution of blanks for leading zeros in a number. For example, 00057 becomes 57 with zero suppression.

zip
One or more files compressed and stored in a single file with a name ending in .zip.

zipped file
A file that contains one or more files that have been compressed using PKZIP, WinZip, or some compatible utility that produces a file with a .zip extension.

zoned decimal format
A format for representing numbers in which the digit is contained in bits 4 through 7 and the sign is contained in bits 0 through 3 of the least significant byte; bits 0 through 3 of all other bytes contain 1's (hex F). For example, in zoned decimal format, the decimal value of +123 is represented as 1111 0001 1111 0010 1111 0011. See also packed decimal format.

zone transfer
The act of a secondary name server obtaining domain information from a master name server.

zone width
The number of positions to the left of the right margin in which to end words.

zoom
To progressively increase or decrease the size of a part of an image on a display or window.

Z-order
In VisualAge RPG, the order in which controls are placed on other controls. This order determines the relationship between controls.

z/OS
An operating system for the IBM eServer product line that uses 64-bit real storage.

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