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IBM PC DOS
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== Notes == {{Reflist|group="nb"|refs= <ref group="nb" name="NB_OEM">For PC DOS the [[DOS API|DOS INT <code>21h</code>]] function <code>30h</code> ''Get DOS version'' returns [[Original equipment manufacturer|OEM]] code <code>00h</code> for [[IBM]] instead of <code>FFh</code> for [[Microsoft]]. This is particularly important for DOS 7, because various features introduced in MS-DOS 7.0 and 7.1 are not supported in PC DOS 7.x, and vice versa, e.g., MS-DOS does not support [[REXX]], and PC DOS 7 and 2000 do not support LBA access.</ref> }}
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