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  Interrupt:   13h     Function:   15h
 
  Title:       Get Disk Type
 
  Description:                                               [AT] [PS/2]
 
     Returns a code indicating the type of floppy or fixed disk
     referenced by the specified drive code. This function is not
     supported on the PC or PC/XT.
 
     Input                            Output
 
     AH = 15h                         If function successful
     DL = Drive                         Carry flag: clear
        = 00h-7Fh floppy disk           AH = Drive type code
        = 80h-FFh fixed disk               = 00h (if no drive present)
                                           = 01h (if floppy disk drive
                                                  without change-line
                                                  support)
                                           = 02h (if floppy disk drive
                                                  with change-line
                                                  support)
                                           = 03h (if fixed disk)
                                      And if fixed disk (AH = 03h)
                                        CX:DX = number of 512-byte sectors
 
                                      If function unsuccessful
                                        Carry flag: set
                                        AH = Status
                                             See: Int 13h Function 01h
                                    -♦-