A non-intrusive power control for a fault tolerant computer system which uses redundant voting at the hardware clock level. The computer includes three or more commercial central processing units (CPUs) operating synchronously. Outputs to system memory and system bus are voted by a radiation tolerant...http://www.google.com/patents/US5923830?utm_source=gb-gplus-sharePatent US5923830 - Non-interrupting power control for fault tolerant computer systems
