resuming means for resuming the execution of a program which was running before the powering off operation by resuming the previous status of the first storing means including registers in {TAIL ~ the computer system}, {HEAD ~ registers} in input/output units, and a volatile storing means, before the powering off operation 
resuming means for resuming the execution of a program which was running before the powering off operation by resuming the previous status of the first storing means including registers in { TAIL ~ the computer system } , { HEAD ~ registers } in input / output units , and a volatile storing means , before the powering off operation
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