| 摘要 |
PURPOSE:To quickly restore a system from the copy destination side by providing bits indicating divisions of instructions in a buffer storage and collating these bits at the time of receiving a trouble occurrence signal of the copy source and stopping write to a main storage for copy by the division of an instruction of write to the copy destination till the next division. CONSTITUTION:Contents of a figure (a) are written in a buffer storage circuit (QUE) 42; and if trouble is reported from a dual controller (MXC) 40 through a line ERR 60 when data '42' is written in information of QUE address 3, namely, in address 202, a copy write control circuit (CPCIR) 43 holds this trouble report. after write up to QUE address 5, data copy is stopped because the bit of an instruction division field INSTF 421 in QUE address 6 is '1'. In the case of system restoration, the restoring operation is started from the copy destination side opposite to the trouble detection side. Thus, the system is quickly restored because the restoring operation is performed without contradictions in instructions.
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