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.
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近期，Anthropic 宣布 Claude Code 能自动梳理 COBOL 依赖、生成文档并识别风险，引发市场对 IBM 主机业务受冲击的担忧，IBM 股价在当地时间本周一录得近 26 年最大单日跌幅，市值蒸发约 310 亿美元。