MEMORY UNIT

摘要

PURPOSE:To reduce the capacity of status memory ROM and to enhance the economical property by storing the information showing the defectiveness only for the address containing the defect. CONSTITUTION:The difference point is that the following units are provided: ROM31 which indicates the normal or abnormal loop in the correspondence of each minor loop of the minor loop group at the address (minor loop number) of the unit information in which the defective minor loop exists and also stores the information showing the defective loop group against the minor loop group based on the minor loop numbers; coincidence detector circuit 33 which detects the value of signal output line 32 of the counter which prescribes the rotary magnetic field of the bubble memory chip and displays the minor loop number of the information being read out currently brom the bubble memory as well as the value the output (bit position 2<15>-2<8>) of the address information of the unit information containing the defective loop plus output line 32; and gate 34 which supplies 2<0>-2<7> bits of ROM31 to control signal production circuit 24 via coincidence signal 33.