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  Function 3BH (decimal 59) changes the current directory exactly as the DOS
  command CHDIR does. To invoke this function, create an ASCIIZ string
  containing the pathname of the new directory. DS:DX contains the address
  of the ASCIIZ string. If an error occurs, function 3BH sets the carry flag
  and returns an error code in AX. The one possible error code is 03H (path
  not found).