Microprocessor
In an intel 8085A, which is the first machine cycle of an instruction?

 A memory read cycle
 A memory write cycle
 An I/O read cycle
 An op-code fetch cycle

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

 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
 More than one device can transmit over the data bus at the same time

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