INT 13 - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911./MS INT 13 Extensions - LOCK/UNLOCK DRIVE AH = 45h AL = operation 00h lock media in drive 01h unlock media 02h check lock status DL = drive number Return: CF clear if successful AH = 00h AL = lock state (00h = unlocked) CF set on error AH = error code (see #00234) Notes: this function is required to be supported for any removable drives numbered 80h or higher a device may be locked even if no media is present in the drive up to 255 locks may be placed on a drive, and the media will not be physically unlocked until all locks have been removed SeeAlso: AH=41h"INT 13 Ext",AH=46h,AH=49h,INT 15/AH=52h"INT 13 Extensions"