Input/output (i/o) unit, Basic Computer Science

Input/output (I/o) unit:

This unit provides the interface between the computer and the computer peripherals. A computer peripheral is any unit, which is attached to, but is not part of, the computer - e.g. visual display units, teleprinters, etc. A simple computing system may have only one input and one output. In such cases, an analogue-to-digital converter (ADC) may suffice for the input, and a digital-to-analogue converter (DAC) for the output. Alternatively, complex-computing systems can literally service thousands of peripherals.

Figure illustrates a simple I/O unit. The I/O unit can be described as a fan-out (and fan-in) device. The computer's 8-bit bi-directional data bus can be connected to port 1, 2 or 3. The port chosen is dependent upon the address, on the address bus. The system illustrated allows three peripherals to communicate with the computer. Only one peripheral at a time can send data to the computer, or receive data from the computer. However, this is not a problem, because the computer works very much faster than the peripheral, and hence, it appears that the computer services all three peripherals simultaneously.

 

542_input output unit.png

Posted Date: 9/13/2012 6:53:29 AM | Location : United States







Related Discussions:- Input/output (i/o) unit, Assignment Help, Ask Question on Input/output (i/o) unit, Get Answer, Expert's Help, Input/output (i/o) unit Discussions

Write discussion on Input/output (i/o) unit
Your posts are moderated
Related Questions
Environments We have seen that intelligent agents might take into account certain information when   choosing   a   rational   action, by  including information from its sensor



THE FIRST GENERATION (1949-1955) The computers in this generation have the following characteristics:     Physically large in size     Inflexible in operations

Code for Program to find the second highest number from a given array in Assembly Language by using NASM

Impact Printers and non - Impact Printers: Impact Printers: These are printers in which the print-head strikes a ribbon, and include the daisywheel and thimble printer

Problem 1. Explain with diagram the internal components of ALU. Diagram Explaining Internal components 2. What is addressing mode? Explain any five addressing mo

The Python language has a lot of similarities to Perl, C and Java. Though, there are some specific differences between the languages. First Python Program: relative Mode Programmin

I. Write an application that accomplishes the following tasks: 1. Read a text file that contains, integers, doubles, alphabet, alphanumeric, and others. The name of the input fil

just the once the instruction has been fetched and is accumulated, the next step is to decode the instruction so as to work out what actions should be performed to execute it. This