A method and apparatus for configuring a computer in a low-power mode are provided. In the low-power mode, dynamic random access memory is refreshed by a battery powered system in order to maintain the memory contents. Low-power mode is entered by saving an interrupt mask and by disabling interrupts,...http://www.google.es/patents/US5163153?utm_source=gb-gplus-sharePatente US5163153 - Low-power, standby mode computer
