Microprocessor
Assertion(A): The frequency of 8085 system is ½ of the crystal frequency. Reason(R): Microprocessor (8085) requires a two phase clock.

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

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Microprocessor
The output data lines of microprocessor and memories are usually tristated because

 The data line can be multiplexed for both input and output
 More than one device can transmit over the data bus at the same time
 It increases the speed of data transfer over the data bus
 More than one device can transmit information over the data bus by enabling only one device at a time

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Microprocessor
In a vector interrupt

 the branch address is assigned to a fixed location in memory.
 none.
 the interrupting source supplies the branch information to the processor through an interrupt vector.
 the branch address is obtained from a register in the processor.

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