there is provided an fifo type data input / output apparatus that enables high - speed data extraction and realizes reduction in size . an instruction signal for data input / output process among adjacent entries including the data input / output direction is given to each entry of the memory circuit including a plurality of entries functioning as the data storage region in order to execute the data write and data read operations among the adjacent entries in the memory circuit . the control signals outputted from the control circuit include the load signal to instruct to latch the data from the data input line to own entry and the shift right signal to instruct to latch the data stored in the left adjacent entry to own entry and these control signals are outputted to each entry to provide an output of the selected data .