Microprocessor
Assuming LSB is at position 0 and MSB at position 7, which bit positions are not used (Undefined) in flag register of an 8085 microprocessor?

 1, 2, 5
 1, 3, 5
 2, 3, 5
 1, 3, 4

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Microprocessor
How can we make any bit of a register “1”?

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

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