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Correct Statements ???

S1 : Generally I/O mapped I/O technique is used to connect more number of I/O devices then memory mapped I/O technique.

S2 : Processor generates memory read (MRD) and memory write (MWR) control signals while communication with I/O devices in memory mapped I/O technique.

S3 : In Isolated I/O : the maximum number of I/O devices that can be addressed by the processor is $2^{20}$ when port address size is 16 bit.

S4 : While communication the I/O devices in I/O mapped I/O, the valuable memory space address is wasted due to the utilization of this memory space address to the I/O devices.
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port address means, number of bits required to uniquely identify the I/O device.
given that port is 16 bits, then maximum we can find $2^{16}$ devices only.

Please post the answers of remaining questions, Moreover no need to call me as sir :)
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@Shaik Masthan Typo 

port is 16 bits, then maximum we can find $2^{12}$ devices only

i think ???????????????

 

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corrected !
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