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)
 irrelevant
 all bits set (i.e. FFH)

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Microprocessor
Program counter in a digital computer

 Counts the numbers of programs run in the machine.
 Counts the number of times a subroutine is called.
 Points the memory address of the next instruction to be fetched.
 Counts the number of times the loops are executed.

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

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

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