lxmode

	LXMODE(mode.i1.r)

	This routine determines how the KOLOR argument will be interpreted by
	the LX color graphics display window context in future calls to any
	of the color graphics routines which write to the screen.  Four write
	modes are available.  MODE is an integer which defines the write mode
	as follows:

		MODE = 0	NORMAL or REPLACE mode.  This is the default
				mode set when a call to LXRST is done.  The
				previous value in the display memory is
				replaced by the new value.
				(PIXEL = KOLOR)

		MODE = 1	OR or SET mode.  The previous value in the
				display memory is OR'ed with the new value.
				(PIXEL = PIXEL .OR. KOLOR)

		MODE = 2	AND or CLEAR mode.  The previous value in the
				display memory is AND'ed with the complement of
				the new value.  No bits are set.
				(PIXEL = PIXEL .AND. (.NOT. KOLOR) )

		MODE = 3	XOR or COMPLEMENT mode.  The previous value in
				the display memory is XOR'ed with the new
				value.
				(PIXEL = PIXEL .XOR. KOLOR)