INT 13,D - Alternate Disk Reset (XT & newer)

	AH = 0D
	DL = fixed drive number  (80h=drive 0, 81h=drive 1)

	on return:
	AH = status  (see INT 13,STATUS)
	CF = 0 if successful
	   = 1 if error

	- many good programming references indicate this function is only
	  available on the AT, PS/2 and later systems, but all hard disk
	  systems since the XT have this function available
	- used to force drive recalibration similar to INT 13,0
	- drive heads are positioned at track zero