qa.hlp (Table of Contents; Topic list)
Int 13H Function 18H
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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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