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이란 “첨단무기 손도 안댔다” 트럼프 “영원히 전쟁 가능”…장기전 가나
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.