Operating System – Device Controller Long Questions Answers

Operating System Long Questions and AnswersHere in this section of Operating System Long Questions and Answers,We have listed out some of the important Long Questions with Answers on Input Output-Device Controller which will help students to answer it correctly in their University Written Exam.


Lists of Long Descriptive type Questions that may be asked in Written Exams.

  • (1)Write a short note on Device Controller. OR Explain Device Controller in brief.


Questions-1 Write a short note on Device Controller. OR Explain Device Controller in brief.

  • I/O unit consist of a mechanical component and an electronic component. Electronic component of I/O devices is called the Device Controller.
  • The mechanical component is device itself.
  • The controller card usually has a connector on it, into which a cable leading to the device itself can be plugged.
  • Some devices have their own built in controller. Many controllers have two, four or even eight identical devices.
  • If the interface between the controller and device is a standard interfacing (ISO, ANSI or IEEE), then companies can make device or controller that fit that interface.
  • The controllers are used to convert the serial bit stream into a block of bytes and perform any error correction if necessary.
  • The block of bytes is typically first assembled bit by bit in buffer inside controller.
  • After verification, the block has been declared to be error free, and then it can be copied to main memory.

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