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I’ll disagree because the 286 systems have quite a capable MMU - capable of running demand paged 286 System V Unix. Not that 64K segments were ultimately that u
by pinewurst 5y ago
I’ll disagree because the 286 systems have quite a capable MMU - capable of running demand paged 286 System V Unix. Not that 64K segments were ultimately that useful as systems grew. But a better MMU than any PDP-11 for sure.
- AnimalMuppet 5y agoBut as a separate chip, right? It wasn't on the same die as the 286, was it?
- icedchai 5y agoMy understanding is the 286 had a limited MMU on board, with memory protection based on 64K segments. Some other CPUs, like the Motorola 68020, did require separate MMUs.
- AnimalMuppet 5y agoYes, the 68020 had a separate MMU; the 68030 had it on-chip.
- pinewurst 5y agoIt was on the same die. Just segmented though, not paged (I was incorrect), though it did run protected Unix and Xenix quite well.