#Mac system preferences input output serial#

The Peripheral devices that communicate with the machine through a connection point also called ports- (one example is a serial port). General categories of storage devices are like disks, tapes, transmission devices (like network interface cards, modems) and human interface devices (like screen, keyboard, etc.).Ī device which communicates with the operating system of a computer by transferring signals over cable or even through the air. These methods form the I/O sub-system of the kernel of OS that separates the rest of the kernel from the complications of managing I/O devices.Ĭomputers operate many huge kinds of devices. This is as I/O devices vary so widely in their functionality and speed (for example a mouse, a hard disk and a CD-ROM), varied methods are required for controlling them. The various devices that are connected to the computer need to be controlled and it is a key concern of operating-system designers. The fundamental role of the operating system in computer Input / Output is to manage and organize I/O operations and all I/O devices. For an example, when we browse a web page or edit any file, our immediate attention is to read or enter some information, not for computing an answer. In most of the cases, the most important job is Input / Output, and the processing is simply incidental. The three main jobs of a computer are Input, Output, and Processing.