| 摘要 |
PURPOSE:To decode the address information on an address bus and to control the sealing for the number of production editions, by using a register and a decoder to form an information transfer system and outputting the edition number information stored in the register onto a data bus at selection and knowing via the decoder whether the register is selected or not. CONSTITUTION:A host circuit 101 consisting of a microprocessor in an information transfer system is actuated by a program instruction. Then a data bus 102 and an address bus 103 are connected to the circuit 101. When the circuit 101 reads the contents of a register 104, the number of the register 104 is designated to the bus 103 and it is known by the output of a decoder 106 whether the register 104 is selected or not. Then the binary edition number input of a combination of A-C is added to the register 104 via an input line 105. The decoder 106 designating the register 104 decodes the address of the bus 103 and puts the contents of the register 104 on the bus 103 to inform said contents to the circuit 101. |
