Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 47h
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     The returned path name does not include the drive identifier or a
     leading backslash (\). It is terminated with a null (00h) byte.
     Consequently, if the current directory is the root directory, the
     first byte in the buffer will contain 00h.
 
     The function fails if the drive code is invalid.
 
     The current directory may be set with Int 21h Function 3Bh.
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