INT 60 u - HP 95LX System Manager - FREE LARGE MEMORY BLOCK                     
	DI = 0904h
	STACK:	2 WORDs unused dummies (for calls from high level languages)
		WORD	segment of memory block???
Return: AX -> ???
	STACK unchanged
SeeAlso: INT 60/DI=0902h,INT 60/DI=0903h