Posted Jul 2, 2010 17:22 UTC (Fri) by gnb (subscriber, #5132)
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>Didn't they use a single-server architecture though?
I think so. And I'm pretty sure OSF/1, err... Digital Unix... Tru64... whatever did too. Basically using MACH to provide the low-level primitives in order to make getting a Unix kernel running, and subsequently porting it, easier.