# List checkpoints
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Фото: Jacek Marczewski/Agencja Wyborcz / Reuters
The 80286 introduced "Protected Mode" in 1982. It was not popular. The mode was difficult to use, lacked paging, and offered no way to return to real mode without a hardware reset. The 80386, arriving three years later, made protection usable -- adding paging, a flat 32-bit address space, per-page User/Supervisor control, and Virtual 8086 mode so that DOS programs could run inside a protected multitasking system. These features made possible Windows 3.0, OS/2, and early Linux.
刚刚返工，我就隐隐嗅到了手机圈的火药味——还有两天时间，三星就要召开 Galaxy Unpacked 全球发布会，亮出开年旗舰 S26 系列。