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.
（七）区域协调发展走深走实，区域经济布局更加优化。一是区域发展协调性不断增强。三大动力源地区引领带动作用巩固提升。四大板块发展均衡性稳步增强。长江、黄河两条绿色发展带建设深入推进。海南自由贸易港正式启动全岛封关运作，“零关税”商品税目比例由21%提高至74%。海洋强国建设走深走实，全年海洋生产总值约11万亿元。成渝地区双城经济圈建设规划纲要顺利收官。革命老区加快振兴发展。老工业城市加快转型。资源型地区积极探索转型发展。民族地区教育、医疗、就业等民生保障持续提升。二是区域联动发展日益深化。跨区域跨流域大通道建设深入推进。重点区域科创产业加快融合。区域间医疗、教育等公共服务设施加快共建共享。省际毗邻地区深化务实合作。，更多细节参见PDF资料
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