3i Infotech Placement: Sample Questions 268 - 269 of 1245

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Question 268

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Write in Short

Short Answer▾

Who were the three famous amigos and their contribution to the object community?

Explanation

  • The Three amigos namely,
    • James Rumbaugh (OMT) : A veteran analysis with an idea about the objects and their Relationships (Associations) .
    • Grady Booch: A design veteran with the idea about partitioning of systems into subsystems.
    • Ivar Jacobson (Objectory) : The father of USECASES, describing the user and system interaction.

Question 269

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Describe in Detail

Essay▾

What is cycle stealing?

Explanation

The Cycle Stealing
  • A method of accessing computer memory or bus without interfering with the CPU.
  • Similar to direct memory access for allowing I/O controllers to read or write RAM without CPU intervention.

Cycle Stealing and DMA

  • The DMA controller uses the data bus when the CPU does not need it.
  • Forces the CPU to temporarily suspend operation.
  • Cycle stealing is done only at specific break points in an instruction cycle when DMA takes control of the bus system and communicates directly with the memory.
  • Cycle-stealing allows DMA controller to transfer data to and from RAM.
  • Allows IO devices to use the RAM without separate memory.

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