SSCURS(mode.i2.r, ix.i2.r, iy.i2.r)

	This routine is used to enable, update, and disable trackball movement
	of the storage scope cursor. To enable the storage scope cursor, call
	SSCURS with MODE = 0. The storage scope cursor will be turned on and
	set to coordinates (IX,IY). Trackball movement of the color TV cursor
	will be disabled. SSCURS should then be called at 15 Hz with MODE = 1
	to update the storage scope position. The coordinates of the current
	storage scope position will be returned in IX and IY. To terminate
	storage scope cursor mode, call SSCURS with MODE = 2.