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