$7\mathrm{.}1$ On a typical microprocessor, a distinct I$/$O address is used to refer to the I$/$O data registers and a distinct address for the control and status registers in an I$/$O controller for a given device. Such registers are referred to as ports. In the Intel $8088,$ two I$/$O instruction formats are used. In one format, the $8-$bit opcode specifies an I$/$O operation; this is followed by an $8-$bit port address. Other I$/$O opcodes imply that the port address is in the $16-$bit DX register. How many ports can the $8088$ address in each I$/$O addressing mode?