| 摘要 |
PURPOSE:To obtain a perfect double system which can have the same data on a magnetic bubble memory device despite an emergent stop by actuating plural magnetic bubble memory circuits with the same instruction. CONSTITUTION:In case the cycle is common with each other between a rotary magnetic field and a control program and the instructions are given simultaneously to said field and program, the rotary magnetic field control signals are given simultaneously to both magnetic bubble memory circuits 5a and 5b. Therefore the subsequent execution routines are actuated also in the same cycle of the magnetic bubble memory rotary magnetic field. Thus the data are always equal completely between the circuits 5a and 5b even though the rotary magnetic field of the magnetic bubble memory is suddenly stopped owing to the service interruption, etc. As a result, both cycles of the rotary magnetic field and control program are set at a fixed timing when a waiting routine starts. Thus the completely same data is secured with a double system magnetic bubble memory device. |
