BY Asst. Prof. Shaili Mishra
• Peripheral Devices • Input-Output Interface • Asynchronous Data Transfer • Modes of Transfer • Priority Interrupt • Direct Memory Access • Input-Output Processor • Serial Communication
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.
Input or Output Devices attached to the computer are also called peripherals An external device connected to an I/O module Provide a means of exchanging data between the external device environment and the computer. Gets inputs from external sources ::Keyboard, mouse, touch screen, barcode reader, Mic, disk etc. Send outputs ::Monitor, Printer, Modem, Speaker, disk etc. Peripheral devices extremely slow to CPU :Large amount of data prepares in advance to transfer to CPU :The result of programs transfer to high-speed disk and then to the peripheral like printers