lxeras

	LXERAS([mplans.i1.r])

	This routine will erase any selected display memory plane in the
	LX color graphics display window.  Memory planes  are selected by
	the optional argument MPLANS as follows:

		BIT	     MEMORY PLANE
		0 (LSB)		Blue
		1		Green
		2		Red
		3		Blink

	If MPLANS is omitted, all memory planes are erased.

	EXAMPLES:

		CALL LXERAS	    ! Will erase entire display
		CALL LXERAS (8)	    ! Will stop all pixels from blinking

	NOTE:	The LXRST routine should normally be used to clear the
		screen the first time a program writes to the LX window.
		This  is  because  LXRST  also  resets  the   LX graphics
		context,  turns  off  the  cursor,  and  sets   the
		LX window and image title for use by the hardcopy system.