Important Notice

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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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    If this function returns with the carry flag set, the disk has not
    necessarily been changed; the change line can be activated by simply
    unlocking and locking the disk drive door without removing the floppy
    disk.
 
    This function is not supported for floppy disks on the PC or PC/XT.
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