Input device
<hardware> A peripheral used to transfer data from the outside world into a computer system.
Some input devices are operated directly by the user, e.g. keyboard, mouse, touch screen, joystick, digitising tablet, microphone; others are sensors or transducers which convert external signals into data, e.g. using an ananlog to digital converter (this would also be true of a microphone).
Other kinds of inputs are really one half of a bidirectional link with another computer or storage device, e.g. serial line, SCSI interface.
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