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

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

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Microprocessor
Which one of the following is not correct?

 Bus is a group of wires
 Bootstrap is a technique or device for loading first instruction
 An instruction is a set of bits that defines a computer operation
 An interrupt signal is required at the start of every program

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