Microprocessor
In 8085 microprocessor system with memory mapped I/O, which of the following is true?

 Arithmetic and logic operations can be directly performed with the I/O data
 Devices have 8-bit address line
 Devices are accessed using IN and OUT instructions
 There can be maximum of 256 input devices and 256 output devices

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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
 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 information over the data bus by enabling only one device at a time

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