4.2.9 Get extended media change status

Entry:

AH - 49h

DL - Drive number

Exit:

carry clear

AH - 00, change-line inactive carry set

AH - 06, change-line active

This function returns media change status. If it returns with carry flag set, the media has not necessarily been changed; the media change notificiation may be activated by simply unlocking and locking the device door without removing the media. This function corresponds to Int 13h Function 16h, but explicitly allows any drive number to be passed in. If a non-removable device supports the Drive Locking and Ejecting interface subset, this function always returns with success, AH=0h, CF=0h. This function clears the media change notification on exit.