| 摘要 |
PURPOSE:To attain a device which can hold input data from an external device even if the normal transfer control is stopped due to trouble, by providing the second transfer control circuit or the like which performs a transfer control easier than a prescribed transfer control. CONSTITUTION:The second transfer control circuit or the like which performs a transfer control easier than a prescribed transfer control is provided. For example, a central processing unit 1 and a main storage part 2 are connected to an external device 8 through a signal line group 4, a bus 3, and a general- purpose interface device 10. If a trouble that a dialogue is not completed or the like occurs, a switching control signal is transmitted from a trouble detecting circuit 11 to a switching circuit 5, and this trouble is reported to an external circuit 8. The signal line group 4 is switched from a transfer control circuit 6 to the second transfer control circuit 9 by the switching circuit 5 to make that the easier transfer control possible for input data from the external circuit 8 or the like is performed at least; and in the external circuit 8, a dialogue signal is ignored to transmit continuously only a data signal and a synchronizing signal if the occurrence of troubles is reported. |
