Microprocessor
Let the content of accumulator and register B be 0000 0100 and 0100 0000 respectively before execution of instruction SUB B. The content of accumulator after the execution of this instruction will be

 00000100
 11000100
 010001000
 01000000

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

 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
 It increases the speed of data transfer over the data bus
 More than one device can transmit information over the data bus by enabling only one device at a time

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