BUBBLE MEMORY DEVICE

PURPOSE:To change the number of parallel actions by a user by writing parallel action information showing the number of the device which operates simultaneously, to a definite area of one special device in the bubble memory device where two devices or above can operate simultaneously. CONSTITUTION:A parallel action information storing area is installed at a #1 device D1. When the number of pages of devices D1, D2... is 2+alpha, a part of the page of auxiliary information, which is not used as a normal data read write area, is used and parallel action device information of the device is stored. When a host computer, for example, starts a bubble memory for the first time (at the time of initialization), first, only the #1 device D1 is initialized (loading, etc., of faulty loop information). Next, the page 2052 is read, the data showing the number of parallel action devices in it are taken out and written in a parallel register (r). After that, initialization is executed at the parallel action device unit and the data are read and written.