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that developed into the IBM Systems Network Architecture, or SNA, basically，推荐阅读服务器推荐获取更多信息
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.。谷歌浏览器【最新下载地址】对此有专业解读