INT 60 u - HP 95LX System Manager - ALLOCATE LARGE MEMORY BLOCK                 
	DI = 0903h
	STACK:	2 WORDs unused dummies (for calls from high level languages)
		WORD	size of block in bytes???
Return: AX -> memory block???
	STACK unchanged
SeeAlso: INT 60/DI=0900h,INT 60/DI=0904h