Interrupt 21h Function 713Bh 

Changes the current directory to the directory specified by the given path.

mov ax, 713Bh     ; Change Directory

mov dx, seg Path  ; see below

mov ds, dx

mov dx, offset Path

int 21h

jc error

Parameters

Path

Address of a null-terminated string specifying the directory to change to. The path, which can include the drive letter, must be a valid path for the given volume. Long filenames are allowed.

Return Value

Clears the carry flag if successful. Otherwise, the function sets the carry flag and sets the AX register to an error value.

Remarks

The current or default directory is the directory that the system uses whenever an application supplies a filename that does not explicitly specify a directory. Similarly, the current or default drive is the drive the system uses whenever an application supplies a path that does not explicitly specify a drive. If a drive other than the default drive is specified as part of the new directory path, this function changes the current directory on that drive but does not change the default drive. Set Default Drive (Interrupt 21h Function 0Eh) can be used to change the default drive.