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Re:DARPA's “Unhackable” Computer by nickpsecurity on Tuesday December 26, 2017 @10:39PM (#16012665)
Trevor Jim revived it a bit with virtualization for those wanting to play with it:

http://trevorjim.com/unfrozen-cyclone/

Re:DARPA's “Unhackable” Computer by nickelbox on Wednesday December 27, 2017 @12:33AM (#16013088)
Oh, that looks interesting, thanks for the link!