Microprocessor
SUB A instruction in 8085

 sets zero and sign flags
 reset carry and sign flags
 reset zero and parity flags
 sets zero and carry flags

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

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

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