Memory Mapped Vs Input/output Mapped

Memory Mapped	Input/output Mapped
16-bit device address is used.	8-bit device address is used.
Data is transferred between any general-purpose register and I/O port.	Data is transferred only between accumulator and I/O port.
The memory map (64K) is shared between I/O device and system memory.	The I/O map is independent of the memory map, 256 input devices and 256 output devices can be connected.
More hardware is required to decode 16-bit address.	Less hardware is required to decode 8-bit address.
Arithmetic or logical operations can be directly performed with I/O data.	Arithmetic or logical operations cannot be directly performed with I/O data.
All instructions related to memory can be used for data transfer.	Only IN and OUT instructions can be used for data transfer.
A large number of I/O ports can be interfaced.	Only 256 ports can be interfaced.
Less memory space is available due to partitioning.	Whole address space is available.
The devices are accessed by memory read and memory write cycle.	The devices are accessed by I/O read and I/O write cycle.
Arithmetic and logical operations can be directly performed with I/O data.	Arithmetic and logical operations cannot be directly performed with I/O data.