The x86 protection model is notoriously complex, with four privilege rings, segmentation, paging, call gates, task switches, and virtual 8086 mode. What's interesting from a hardware perspective is how the 386 manages this complexity on a 275,000-transistor budget. The 386 employs a variety of techniques to implement protection: a dedicated PLA for protection checking, a hardware state machine for page table walks, segment and paging caches, and microcode for everything else.
Tony Jolliffe/BBC News
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I first looked through everything I had written. I already had started an “overview” page but hadn’t gotten very far on it. I also have 22 separate pages that were “diary style”, about what I did rather than what you should know.
（四）私分、侵占、挪用、故意损毁所收缴、追缴、扣押的财物的；
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12:58, 27 февраля 2026Наука и техника
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