| 摘要 |
PURPOSE:To make it possible to restore without writing data even if mulfunction occure in an address administration circuit by reading the data string in the memory at the time when it is necessary and by resetting address values of the address administration circuit and data in the magnetic bubble memory to reference state. CONSTITUTION:A reference code detecting circuit 5 is disposed between an address administration circuit 3 and a magnetic bubble memory 4. When the address circuit 3 makes mulfunction and is in a state shifted X times, the read gate opens, which in normal cases opens at n2 times shift, opens at (n2-X) times shift. The first data D outputted from the magnetic bubble memory 4 is sent to a reference code comparing circuit 7 and compared with the reference data E. But, as a matter of course, as they do not coincide each other, the address administration circuit 3 continues shift operation. Next, when a reference code is read from the magnetic bubble memory 4, and since they coincide each other, the reset signal RST is sent to the address administration circuit 3, and the counter address is resetted in the standard address.
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