Microprocessor
The content of the A15-A8 (higher order address lines) while executing “IN 8-bit port address” instruction are

 all bits set (i.e. FFH)
 irrelevant
 same as the content of A7-A0
 all bits reset (i.e. 00H)

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

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

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Microprocessor
DS directive in 8085

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

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