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
Question 1 Describe the following with respect to creating Web Forms in .Net environment- Web Form Life Cycle Creating a Web Form Write programs with corresponding


You are an engineer involved in the development of a financial system. During installation, you discover that this system will make a significant number of people redundant. The pe


Questions 1) Polynomial Integrals Problem: Write an X86-series assembly language program that calculates and prints out (in a nice form) the indefinite integral of a simple polynom

QUESTION (a) You have been asked to design and implement a chat application. Which protocol would you used TCP or UDP? Justify your answer. (b) Explain why multithreading is


Sequential-access memory device: A  Sequential-access  memory device reads data in sequence. In other words, information on a serial device can only be retrieved in the same s

what is operator and operator associatively

what can you do and what and how who can becbgbfbvuidfgvbkjfdhvb98dshrnfjkbhqdbnfiubnfdjbhdfiubndfubhfdbhfdiubhdfuibhyfdubhdfbhfbhdf8u