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Microprocessor

Microprocessor
A single instruction to clear the lower nibble of accumulator in 8085 language assembly is

 XRI 0FH
 ANI F0H
 XRI FOH
 ANI OFH

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Microprocessor
Which of the following is a valid integer constant?

127
127
127
125 + 3

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Microprocessor
CALL instruction is a ______ instruction.

 3 bytes
 2 bytes
 1 bytes
 4 bytes

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Microprocessor
DMA is used between

 microprocessor and I/O
 none
 memory and I/O
 microprocessor and memory

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Microprocessor
Assertion(A): Address bus is unidirectional. Reason(R): Data bus is bidirectional

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

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

 ORI 0FH
 XRI 0FH
 CMA
 ANI 0FH

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