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The term can also be used as part of an action; to "perform I/O" is to perform an input or output operation. I/O devices are the pieces of hardware used by a human (or other system) to communicate with a computer. For instance, a keyboard or computer mouse is an input device for a computer, while monitors and printers are output devices.
A common computer input device, a keyboard. A user presses a key which transfers information to a computer. In computing, an input device is a piece of equipment used to provide data and control signals to an information processing system, such as a computer or information appliance.
In computer science, the general meaning of input is to provide or give something to the computer, in other words, when a computer or device is receiving a command or signal from outer sources, the event is referred to as input to the device. Some computer devices can also be categorized as input devices [1] because we use these devices to send ...
Common examples include keyboards and mice (input) and displays and printers (output). Network interface controllers are used to access the Internet . [ 63 ] USB ports also allow power to connected devices—a standard USB supplies power at 5 volts and up to 500 milliamps (2.5 watts ), while powered USB ports with additional pins may allow the ...
In 1956, the Whirlwind Mark I computer became the first computer equipped with a keyboard-printer combination with which to support direct input [4] of data and commands and output of results. That device was a Friden Flexowriter , which would continue to serve this purpose on many other early computers well into the 1960s.
A computer program is useful for another sort of process using the input-process-output model receives inputs from a user or other source, does some computations on the inputs, and returns the results of the computations. [1] In essence the system separates itself from the environment, thus defining both inputs and outputs as one united ...
Input and output voltages are usually, but not always, limited to the supply voltage of the device with the GPIOs, and may be damaged by greater voltages. A GPIO pin's state may be exposed to the software developer through one of a number of different interfaces, such as a memory-mapped I/O peripheral, or through dedicated IO port instructions.
An interaction technique is a way of using a physical input/output device to perform a generic task in a human-computer dialogue. [1] A more recent variation is: An interaction technique is the fusion of input and output, consisting of all software and hardware elements, that provides a way for the user to accomplish a task. [2]