INT 13 - FLOPPY DISK - DETECT DISK CHANGE (XT 1/10/86 or later,XT286,AT,PS)
AH = 16h
DL = drive number
Return: CF clear if change line inactive
AH = 00h (disk not changed)
CF set if change line active
AH = 06h change line active or not supported
= 80h drive not ready or not present
Note:   call AH=15h first to determine whether the drive supports a change
line

See also: 1315

1316 - FLOPPY DISK - DETECT DISK CHANGE (XT 1/10/86 or later,XT286,AT,PS)