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  1. Devices have 8-bit address line
  2. Devices are accessed using IN and OUT instructions
  3. There can be Maximum of 256 input devices and 256 output devices
  4. Arithmetic and logic operations can be directly performed with the I/O data
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Option 4 : Arithmetic and logic operations can be directly performed with the I/O data

Arithmetic and logic operations can be directly performed with the memory I/O data whereas IN and OUT are performed on I/O Mapped I/O data.

Also memory mapped I/O mapped has 16 bit address line whereas I/O mapped I/O data has only 8 bit address lines.
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