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Most computer systems use the mini-DIN PS/2 connector; but an growing number of new systems are dropping the PS/2 connectors in favor of USB. No matter which kind of connector is used, two principal components are sent via the connecting cable. Keyboards require a small amount of power, usually about 5 volts, in order to function. The cable additionally carries the info from the keyboard to the pc. Metal contact and foam component keyboards aren't as widespread as they was once.

Both technologies have good tactile response, make satisfyingly audible "clicks" and are cheap to provide. The problem is that the contacts have a tendency to wear out or corrode sooner than on keyboards that use other technologies.

Also, there isn't a barrier that prevents mud or liquids from coming in direct contact with the circuitry of the key matrix. Rubber dome change keyboards are inexpensive, have fairly good tactile … Read More