| 摘要 |
PURPOSE:To achieve program instruction for data input and output without consciousness of the amount of input and output data with the program, by terminating the transfer, through the coincidence between the transmission and reception data to an input and output device and the content of a register set from the program in advance. CONSTITUTION:A card reader 1 converts the information of paper card into a 7- bit unit code and transmits it. The transmitted data is given to a storage device 4 via an input data signal line 3 in an input and output controller 2. The device 2 is provided with a register 5 storing the data designated from a program, circuit 6 detecting the coincidence with the data inputted from the card reader 1, and transfer control circuit 7. The distance between the reader 1 and the circuit 7 is connected through a control tag line and the distance between the circuit 7 and the device 4 is connected with the control tag line. The circuit 7 controls the tag lines 8, 9 through the output of coincidence or dissidence from the circuit 6. |
