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2. in(DX, AL) to read date from the port.These instructions read a byte from an input port and place the input date into the accumulator register AL Must use DX register to hold the 16-bit port number. Example, (1) mov(S379, DX), in($379, AL); (2) mov (S61, DX), in(SDX, AL) AL ister to hold th a 2. in(DX, AL) to read date from the port.These instructions read a byte from an input port and place the input date into the accumulator register AL Must use DX register to hold the 16-bit port number. Example, (1) mov(S379, DX), in($379, AL); (2) mov (S61, DX), in(SDX, AL) AL ister to hold th a