Credit: Stan Schroeder/Mashable
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.
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In fact, in most operating system manuals this is the first chapter, combined with “how to install an OS”, but Android is a little different in that:，详情可参考咪咕体育直播在线免费看
（五）除船舶所有人外，采取预防措施的任何人；
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