Abstract: In a cassette type magnetic bubble memory device comprising: a magnetic bubble memory device mounted to a base plate and having a magnetic bubble memory element, a pair of coils for generation of a rotating field for driving the element, and a pair of permanent magnet plates and yoke plates for applying a bias field to the element; and an electric signal connector section provided on one end of the base plate and adapted to be connected to a loader, an electrically conductive metal frame is provided which surrounds at least the connector section, and a resin sealing medium is provided which seals at least the magnetic bubble memory device continuously to the inner walls of said frame.

Abstract: In a detector of an magnetic bubble memory device of the type comprising a magnetic bubble memory element having a detector, a source of constant current for passing constant current through the detector for producing a bubble output signal according to the magnetoresistive effect of a detector, a preamplifier for amplifying the output signal, a DC regenerator for regenerating an output signal of the preamplifier and a discriminator for converting the DC regenerated signal into a binary code, there is provided a holding circuit connected between the DC regenerator and the discriminator for holding a peak value of the DC regenerated signal for a predetermined time.

Abstract: In a magnetic bubble memory apparatus of cassette type comprising a magnetic bubble memory device and a signal detector contained in a cassette, the memory device and the signal detector are surrounded by a grounded shield made of electroconductive material.

Abstract: Method and apparatus for testing a magnetic bubble memory are disclosed wherein a most severe magnetic bubble domain arrangement which fully causes the ununiformity of magnetic interaction between magnetic bubble domains is experimentally determined, and a basic pattern [P] and a test information pattern determining an arrangement of the basic patterns [P] and complementary patterns [P] thereof for realizing that magnetic bubble domain arrangement are stored in memory units, respectively, and the basic patterns [P] and the complementary patterns [P] are sequentially read out in accordance with the test information pattern to generate magnetic bubble domain trains in a storage area of the magnetic bubble memory.