Microprocessor
In microprocessor based system I/O ports are used to interface

 the O/P devices only
 the I/O devices and memory chips
 the I/P device only
 all the I/O devices

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

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Microprocessor
When RET instruction is executed by any subroutine then

 without any operation, the calling program would resume from instruction immediately following the call instruction.
 the top of the stack will be popped out and assigned to the PC.
 the PC will be incremented after the execution of the instruction.
 without any operation, the calling program would resume from instruction immediately following the call instruction and also the PC will be incremented after the execution of the instruction.

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