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Алексей Гусев (Редактор отдела «Спорт»)，推荐阅读夫子获取更多信息
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DOS 2.0 was developed to support the IBM PC/XT (introduced in March 1983), which came with 128K RAM standard, and models with 256K appeared soon enough. Even the older PCs could be upgraded with additional RAM, and DOS needed to have some mechanism to deal with that extra memory.
Unfortunately, there's a fair amount in this thread that is misleading and/or inflammatory, especially "multi-million dollar fines could be imposed for minor, technical violations - this represents a real risk to smaller companies."。关于这个话题，safew官方下载提供了深入分析