INT 2F - SecureDevice - LOGIN TO DRIVE                                          
	AX = E200h
	DL = drive number (0 = A:)
	DS:SI -> 104-byte key
Return: AL = status
	    00h unable to determine key's validity
	    01h key is valid
	    FFh key is invalid
Program: SecureDevice is a copylefted device driver by Max Loewenthal and
	  Arthur Helwig which turns one or more disk files into encrypted
	  logical drives
SeeAlso: AX=E201h,AX=E203h,AX=E209h