Peripheral Devices: The Input / output organization of computer depends upon the size of computer and the peripherals connected to it. The I/O Subsystem of the computer, provides an efficient mode of communication between the central system and the outside environment In this article we’ll explore several examples of peripheral devices in computers and explain what they do. Input devices are among the more misunderstood elements of computer peripherals. People usually assume that an input device is always going to let you manipulate elements within a computer. Peripheral device, device used to enter information into a computer or deliver processed data to a human or another machine. Peripherals are commonly divided into three kinds: input devices, output devices, and storage devices. Learn more in this article. There are some peripheral devices found in computer systems including digital incremental plotters, optical and magnetic readers, analog to digital converters, and several data acquisition equipment.