INT 2F - CD-ROM - GET DRIVE DEVICE LIST                                         
	AX = 1501h
	ES:BX -> buffer to hold drive letter list (5 bytes per drive letter)
Return: buffer filled, for each drive letter
	  BYTE	subunit number in driver
	  DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address. address of device driver header (see #01646)
Note:	reportedly returns AX=0000h and an invalid address under Windows95;
	  other reports say it works fine
SeeAlso: AX=1510h