| 摘要 |
<p>PURPOSE:To prevent malfunction caused by the fault of connection at a connector by providing the contact confirmation control circuit of the connector to electrically connect an address bus, control bus and data bus to a terminal equipment. CONSTITUTION:An address bus 10 and a data bus 12 are respectively composed of 8 bit buses and a control bus 11 is formed by a write enable signal line 13, cut enable signal line 14 and output enable signal line 26. Further, between a contact confirmation control circuit 15 and a connector 35, a test signal line 16 is connected and a pull-down resistor 22c is connected to this test signal line 16. A power supply input line 7 is connected to the contact confirmation control signal 15 for power supply. Thus, it can be confirmed whether the connection of the connector 35 is right or not, and the malfunction caused by the fault of the connection at the connector 35 is prevented.</p> |
