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
 all bits reset (i.e. 00H)
 all bits set (i.e. FFH)
 irrelevant

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Microprocessor
How can we make any bit of a register “0”?

 AND that bit with “0” and remaining bits with “1”.
 OR that bit with “0” and remaining bits with “1”.
 AND that bit with “1” and remaining bits with “0”.
 OR that bit with “1” and remaining bits with “0”.

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