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Intel did this is 1989 with iAPX 432. Super interesting and SUPER complex (just check out the documentation of cpu architecture), that's it failed hard.

Flat memory model always win vs Star Trek like architecture who bo one understands

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1970s-ish capability systems with support in hardware/firmware include CAP, Flex, System/38, Plessey System 250 (which a former colleague worked on) -- the last two commercial; see https://en.wikipedia.org/wiki/Capability-based_security.

I'd like to think their time has come, given vulnerabilities I see.

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