The central processing unit of an integrated circuit data processing system includes both means for processing a first non-maskable interrupt (NMI) request received by the data processing system on a first NMI request line and means for processing a second NMI request received by the data processing...http://www.google.com/patents/US5649208?utm_source=gb-gplus-sharePatent US5649208 - Mechanism for handling non-maskable interrupt requests received from different sources
