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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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▀ To set the default drive, use Int 21H Function 0EH.
 
▀ Some other Int 21H functions use drive codes beginning at 1 (that is,
  1=A, 2=B, etc.) and reserve drive code zero for the default drive.
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