Microprocessor
Program counter in a digital computer

 Points the memory address of the next instruction to be fetched.
 Counts the number of times a subroutine is called.
 Counts the numbers of programs run in the machine.
 Counts the number of times the loops are executed.

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Microprocessor
Assertion(A): Segment override prefix (SOP) is used when a default offset register is not used with its default base segment register but with a different base register. Reason(R): The offset registers IP and SP can never be associated with any other segment registers apart from their respective default segments.

 Both A & R are true and R is the correct explanation of A.
 A is false but R is true.
 Both A & R are true but R is not the correct explanation of A.
 A is true but R is false.

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Microprocessor
How can we make any bit of a register “0”?

 AND that bit with “0” and remaining bits with “1”.
 OR that bit with “0” and remaining bits with “1”.
 OR that bit with “1” and remaining bits with “0”.
 AND that bit with “1” and remaining bits with “0”.

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