INT 60 - HP 95LX System Manager - ALLOCATE REGULAR MEMORY BLOCK                 
	DI = 0900h
	STACK:	2 WORDs unused dummies (for calls from high level languages)
		WORD	size of block in bytes
Return: AX -> memory block
	STACK unchanged
Note:	System Manager-compliant applications are always small-model (64K code,
	  64K data)
SeeAlso: INT 15/AX=4DD4h,INT 60/DI=0902h,INT 60/DI=0903h