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

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

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Microprocessor
The interrupt facility is provided in microprocessor to

 keep a control on the working of the microprocessor
 stop the microprocessor when it starts malfunctioning
 change the sequence of the instructions being executed
 stop the microprocessor when desired

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