Note that INT 21h/58h was not documented in official Microsoft programming references for DOS 2.x, 3.x, and 4.0. The DOS 5.0 reference does document AllocOper, but claims that it was added in DOS 3.0, which is not quite true.
不管是底层硬件还是软件 UI，iPad 和 Mac 都变得越来越趋同，连应用都开始互相兼容。最大的区别除了系统，似乎就只剩下一块触控屏，而这也迟早会被打破。
，这一点在PDF资料中也有详细论述
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