أكاديميا - كولنز - معاجم الجيب العلمية - الكمبيوتر - انكليزي - فرنسي - عربي الحرف ١_h

Academia - Collins - Pocket Scientific Dictionaries - Computer - English - French - Arabic Letter 1_H

half - adder
demi additionneur n

Half adder. A logic circuit (consisting of a set of gates) with two inputs and two outputs.
It is used to add two binary digits and give the sum and the relay number.

half - duplex
semi - duplex

Half duplex See duplex operation.

handpunch
perforatrice f manuelle

Manual puncher. A mechanical punching machine. In the case of punched cards, pressing one or two of the twelve buttons punches the corresponding holes and the card moves forward one column. In the case of paper tape, the operator has a complete contact panel, and the tape moves forward after each character is punched.

handshake
établissement m de liaison

Meet. This word refers to signals such as "ready to receive", "start sending", "cut", "know" and "wait", which help to control the transfer of data between computers and peripheral devices.

hard copy
copie f imrimée

A hard copy. It is the printed output - usually on paper - that can be taken and studied.

hard disk store
disque m dur

Hard disk store. A disk housed in its unit. Because the disk cannot be removed from its place, the read/write head can be very close to the surface and the tracks can be compressed and dense. Due to the geometric precision, a hard disk has a much greater capacity than a plastic disk, which is traditionally up to 140 megabytes for a microdisk. As with plastic disks, data and programs can be added to, edited and erased by software commands. Hard disks are also known as Winchester disk drives.

hard sectored

implantation f fixe des secteurs

Hard sector. A term describing the way in which the length of a sector is determined in a floppy disk. In this case, small holes (say 6 or 12 in the ring) close to the central hole of the disk determine the length of each sector: as the disk rotates, the holes indicate the change from one sector to the next.

hardware
hardware m

Hardware. Devices. A name given to all the electronic equipment that makes up a computer system. If it can be lifted and carried, it is hardware in comparison to software.

hardwired logic
logique ƒ câblée

Hardwired logic The logic that the manufacturer installs in an integrated circuit (or chip) and refers to the wired connection between the gates as well as to the gates themselves.

hash total
total m de control

Check sum. Sometimes called batch total, this is what happens when a computer adds a reference number or number of each item in a file, giving a meaningless total, or a checksum. This is used on subsequent occasions to make sure that all items have been entered correctly.

hertz
hertz m

Hertz is the standard unit of frequency. It is named after the German physicist Heinrich Rudolf Hertz (1857 - 1894) who artificially transmits electromagnetic waves. The basic unit of hertz (Hz) is one cycle per second, while at high computing speeds the kilohertz (KHz) is used, i.e. 1000 Hz, and the megahertz (MHz) is one million Hz.

heuristic program
programme m heuristique

A heuristic program. A program written so that whenever it solves a problem it learns from itself and makes changes to improve performance the next time.