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, 3, 4
 2, 3, 5
 1, 3, 5
 1, 2, 5

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

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

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Microprocessor
The output data lines of microprocessor and memories are usually tristated because

 More than one device can transmit information over the data bus by enabling only one device at a time
 It increases the speed of data transfer over the data bus
 More than one device can transmit over the data bus at the same time
 The data line can be multiplexed for both input and output

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