Appareils électroniques (document en anglais)

1) Three examples of devices which use electronic memories are: game consoles, car radios and digital cellular phones.

2) The function of RAM is to hold data and instructions for immediate use by the computer. It receives and stores information from an input device. It can be accessed quickly and directly regardless of where the contents are located.

3) RAM facilitates processing because it can be accessed quickly and directly regardless of where the contents are located.

4) The cache use is a capacity which reduces the time to locate and transfer data the computer for processing. When a computer accesses its main memory, it first checks to see if the information is not already stored in the cache.

5) Virtual memory is technique which virtualizes the main storage available to a process or task.

6) Devices which are used for long term storage are hard disks, diskettes, ZIP disks, tapes, etc….

7) For long term storage and the saving of large amounts of data, most computer systems use auxiliary storage devices such as hard disks, diskettes, ZIP disks, tapes, etc… which can store a lot of data relatively cheaply. Data remains on these devices even when the computer is switched off.

B)

Tapes

1: 0.5 2: 1.0

3: 0.0001 4: 250

5: 600 6: 1200

7: 2400 8: 1600

9: 6250 10: 175

C)

Accès Direct

RAM est rendue possible par un système d'adresses (une série de minuscules compartiments). Les informations présentes dans ces compartiments est appelé le contenu de la mémoire.

Les adresses sont représentés et sélectionnés au moyen d'impulsions électroniques et aucun mouvement physique du support de stockage est nécessaire.

Le temps d'accès est très courte (nanoseconde: 10 -9 secondes) et est constante pour n'importe quel élément de données stockées dans la mémoire.

La fiabilité est élevée.

La consommation électrique est faible.

Les composants sont de petite taille et une unité relativement petite peut fournir une grande capacité de stockage.

D)

1 – There is little space in memory.

2 – CPUs were reduced in both size and cost.

3 – This type of memory uses less power and is very reliable.

4 – We want this program costs the cheapest possible.

5 – Like many other inventors, he received little encouragement at first.

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