MAGNETIC BUBBLE MEMORY DEVICE

PURPOSE:To decrease the data transfer time by setting a data transfer flag in a prescribed data unit in a data buffer in a bubble controller. CONSTITUTION:In storing a data of M-byte at read in a data buffer 4 in a bubble controller 3 and in causing a space by M bytes at write, a prescribed amount (M+alpha bytes) of data are stored and read/write is attained asynchronously independently. In such constitution above, a data transfer flag RDY is set on the basis of the upper limit of the data buffer 4 at write and on the basis of the lower limit of the data buffer 4 at read and the flag is outputted switchingly to the same bit location of a status register 5 of the bubble memory depending on the read/write. Then a status register 5 of the bubble controller 3 is assigned and when the RDY is set, a designated byte number is transferred in the lump. Thus, the transfer time per byte is reduced remarkably.