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What is the work of status register in I/O operation ?
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status register are connected to the data bus. The status register contains information relevant to the operation of the I/O module.

The status register is a hardware register that contains information about the state of the processor. Individual bits are implicitly or explicitly read and/or written by the machine code instructions executing on the processor. The status register lets an instruction take action contingent on the outcome of a previous instruction.

Typically, flags in the status register are modified as effects of arithmetic and bit manipulation operations. A status register may often have other fields as well, such as more specialized flags, interrupt enable bits, and similar types of information.

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If i m not wrong is status register is the program status word.
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FGI(flag input) and FGO(flag output) are two status register used in i/o,....whenever FGI=1 means input is available in input buffer and its low value means that input is consumed..

similarly whenever FGO=1 means output buffer is empty, and FGO=0 means output buffer is still not empty.
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Thanks @joshinitish
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