Operating System – Device Controller Long Questions Answers

Here 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.