A computer system is provided wherein dynamic random access memory within the system is refreshed by executing one of two refresh cycles. The computer system includes system dynamic random access memory and optional expansion dynamic random access memory which may be installed on an input/output bus....http://www.google.es/patents/US5379400?utm_source=gb-gplus-sharePatente US5379400 - Method and system for determining memory refresh rate
Method and system for determining memory refresh rate