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A structure is described in a major/minor loop bubble memory for removi an unwanted record from the major loop in a bit-parallel fashion without going through the read station.
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Simple Structure for Instantaneous Deletion of Records in Bubble Memory
A structure is described in a major/minor loop bubble memory for removi an
unwanted record from the major loop in a bit-parallel fashion without going
through the read station.
Conventionally, a record in a major/minor loop bubble memory consists of
one bit from each minor loop. The minor loops are rotating synchronously. To
reach a record, all the bits are transferred in parallel to the major loop, shifted to
the read station, and read serially. Before all the bits are shifted to the read
station, no more transfer from the minor loops to the major loop is allowed. In
general, one can either transfer a copy of the record from the minor loops to the
major loop (non-destructive read), or transfer the record directly (destructive
However, if we want to delete a record from the minor loops or after we have
transferred a record to the major loop and found out that the record is unwanted,
it is desirable to remove the record immediately so that the next transfer of record
from minor loops can be carried out without delay.
A simple structure is presented in the figure specifically for this purpose. A T-
I bar configuration illustrates the operation. Of course, it can be implemented in
any other kind of bubble technologies such as chevrons, contiguous disks, etc.,
with equal simplicity.
In the figure, the bubbles 10 are on the major loop 12. They occupy position
1 while the magnetic field is p...