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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     A floppy disk must be present in the drive.
 
     This function should be called prior to formatting a disk with Int
     13h Function 05h so that the ROM BIOS can set the correct data
     rate for the media.
 
     If the change line is active for the specified drive, it is reset.
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