If this function returns with the carry flag set, the disk has not necessarily been changed; the change line can be activated by simply unlocking and locking the disk drive door without removing the floppy disk.Returns the status of the change line, indicating whether the disk in the drive may have been replaced since the last disk access.
Call with:
AH = 16H
DL = drive
00H—7FH floppy disk
Returns:
If change line inactive (disk has not been changed)
Carry flag = clear
AH = 00H
If change line active (disk may have been changed)
Carry flag = set
AH = 06H
Notes:
If this function returns with the carry flag set, the disk has not necessarily been changed; the change line can be activated by simply unlocking and locking the disk drive door without removing the floppy disk.
This function is not supported for floppy disks on the PC or PC/XT.