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.
Tesco will cut 180 head office jobs as it adjusts to changing shopping habits.
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「我覺得就像每一個進入中國的外國人一樣，因為我喜歡攝影，我很喜歡在中國拍攝辛苦的勞工、地攤市場上的毛澤東畫像、紅色五角星，我得說我覺得我趕在『成為中國人』這個潮流走紅之前就在學習『成為中國人』，」安迪這樣告訴BBC中文，打趣稱在他回國後，很多朋友都問他是否有成為「黨員」、打算作為「間諜」效忠北京。
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