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Microprocessor

Microprocessor
In order to complement the lower nibble of accumulator one can use

 ORI 0FH
 CMA
 XRI 0FH
 ANI 0FH

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Microprocessor
Consider the following statements: Arithmetic Logic Unit (ALU) 1.Performs arithmetic operations 2.Performs comparisons. 3.Communicates with I/O devices 4.Keeps watch on the system Which of these statements are correct?

 1 and 2 only
 3 and 4 only
 1, 2 and 3
 1, 2, 3 and 4

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Microprocessor
I)A total of about one million bytes can be directly addressed by the 8086 microprocessor II)8086 has thirteen 16-bit registers III)8086 has eight flags IV)Compared to 8086, the 80286 provides a higher degree of memory protection Which one of the statements given above are correct?

 1,3 &4
 1,2 & 4
 2,3&4
 1,2 & 3

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Microprocessor
The stack pointer

 resides in ROM
 resides in microprocessor
 may be in RAM or ROM
 resides in RAM

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

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Microprocessor
The number of output pins in 8085 microprocessors are

 40.
 21.
 19.
 27.

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