VIPER microprocessor
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VIPER is a mircoprocessor design created by Royal Signals and Radar Establishment intended for use in safety critical systems. It was the first commercial microprocessor design to be formally proven correct, although there was some controversy surrounding this claim and the definition of proof.
External Links
http://www.nature.com/nature/journal/v352/n6335/abs/352467a0.html http://www.nature.com/nature/journal/v352/n6335/abs/352467a0.html