| 摘要 |
PURPOSE:To quicken initial readout of defective loop information, by storing the defective loop information in the major loop at no use and storing the defective information to RAM and also storing it in the minor loop at usage. CONSTITUTION:At no use, the bubble 11 for defective loop information is stored in the major loop 5. At usage, the bubble 11 is read out from the major loop and it is stored in the external RAM for defective information through the switching section. At the same time, the bubble 11 is copied with replicator 8 to transfer it in the minor loop 6. With this constitution, the ROM exclusively used for defective loop is made unnecessary to quicken the initial readout of the defective loop information. Since the defective loop information is stored also in the minor loop, the storage of the defective loop information is ensured. |
