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Apple also shipped A/UX which did all that

• wmf 10y ago
  And was so expensive no one cared.
  • rbanffy 10y ago
    And this is probably the greatest inhibitor Unix had for its adoption.
• switchbak 10y ago
  They also shipped the Lisa prior to that, which also had protected memory and pre-emptive multitasking. This died for other reasons however (too expensive, upstaged by the mac, etc).