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
 There can be maximum of 256 input devices and 256 output devices
 Devices are accessed using IN and OUT instructions
 Devices have 8-bit address line

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Microprocessor
Ready pin of microprocessor is used

 to indicate that microprocessor is ready to receive outputs
 to provide direct memory access
 to indicate that microprocessor is ready to receive inputs
 to introduce wait state

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