INT 60 u - HP 95LX System Manager - GET DEFAULT DRIVE                           
	DI = 0513h
	STACK:	2 WORDs unused dummies (for calls from high level languages)
		DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.	pointer to ??? buffer for current drive
Return: ???
	STACK unchanged
SeeAlso: INT 21/AH=19h,INT 60/DI=0514h