The general characteristics of I/O are described effectively in this post. One communications with a microcomputer system via the I/O devices interfaced to it. The user can enter programs and data using the keyboard on a terminal and execute the programs to obtain results. Therefore the I/O devices connected to a microcomputer system provide an efficient means of communication between the computer and the outside world. In a typical microcomputer system the user gets involved with two types of I/O devices physical I/O and logical I/O. when the microcomputer has no operating system the user must work directly with physical I/O devices and perform details I/O design. Read More