INT 60 - HP 95LX System Manager - CLEAR PORTION OF SCREEN

	DI = 0301h
	STACK:	2 WORDs unused dummies (for calls from high level languages)
		WORD	starting row (-3 is topmost, 0 is first user line)
		WORD	starting column
		WORD	number of rows
		WORD	number of columns
Return: ???
	STACK unchanged
SeeAlso: INT 60/DI=0302h,INT 60/DI=1005h