A main memory has a plurality of divided storage areas. A central processing unit saves data from each storage area of the main memory into an auxiliary memory during a normal operation of a computer system, and sets a flag corresponding to each storage area, from which the data is saved, in a state...http://www.google.ca/patents/US5420996?utm_source=gb-gplus-sharePatent US5420996 - Data processing system having selective data save and address translation mechanism utilizing CPU idle period
