Operating System

A bit in a memory cache or virtual memory page 

that has been modified by the CPU, but not 

yet written back to storage.

Auto increment:

 In auto-increment addressing mode the address where next data block to be stored is generated automatically depending upon the size of single data item required to store.
Self relocating code takes always some address in memory and statement says that this mode is used for self relocating code and  no additional ALU is required 



Which of the following is/are true of the auto-increment addressing mode?
I.  It is useful in creating self-relocating code.
II. If it is included in an Instruction Set Architecture, 
    then an additional ALU is required for effective address 
    calculation.
III.The amount of increment depends on the size of the data
     item accessed.
(A) I only
(B) II only
(C) III Only
(D) II and III only


Answer: (C)
Dirty bit is used to show

  • Page with corrupted data
  • Wrong page in memory
  • Page that is modified after being loaded in the cache memory
  • page that is less frequently accessed
Answer: Option C

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