Microprocessor
A sequence of two registers that multiplies the content of DE register pair by two and stores the result in HL register pair (in 8085 assembly language) is

 XCHG & DAD H
 PCHL & DAD D
 XTHL & DAD H
 XCHG & DAD B

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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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