INT 13 - FLOPPY DISK - SET DISK TYPE FOR FORMAT (AT,PS)
        AH = 17h
        AL = format type
            01h = 320/360K disk in 360K drive
            02h = 320/360K disk in 1.2M drive
            03h = 1.2M disk in 1.2M drive
            04h = 720K disk in 720K drive
        DL = drive number
Return: CF set on error
        CF clear if successful
        AH = status (see AH=01h)
Note:   this function does not handle 1.44M drives; use AH=18h instead
SeeAlso: AH=18h