INT 4F - ATA Software Programming Interface (ATASPI) - SEND ATASPI REQUEST AX = 0081h ES:BX -> ATA Request Block (see #90002) Return: AH = 00h always??? Note: this interface has probably appeared in some later revisions of ATASPI than 0.72 SeeAlso: INT 21/AX=4402h"ATASPI",INT 4F/AX=0082h