$.$ Consider a hypothetical microprocessor generating a address $($e$.$g$.,$ assume the program counter and the address registers are wide$)$ and having a data bus. What architectural features will allow this microprocessor to access a separate $$I$/$O space$?$If an input and an output instruction can specify an I$/$O port number, how many I$/$O ports can the microprocessor support? How many I$/$O ports? Explain.