Assembly Language Help (alang.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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