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

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

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Microprocessor
DS directive in 8085

Forces the assembler to reserve a specified number of bytes in the memory
None of these
Forces the assembler to reserve a specified number of consecutive bytes in the memory
Forces the assembler to reserve one byte of memory

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Microprocessor
Assertion(A): Ready signal of microprocessor is used to detect whether a peripheral is ready for the data transfer or not. Reason(R): In the microprocessor during data transfer operations, the wait states are added by forcing the ready signal low.

 A is true but R is false.
 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 .

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