        REM MOVX
        REM This droid moves to the right slowly at first, stops
        REM then moves quickly and stops.  It does the same
        REM when it moves to the left

        100 xvel=50     : rem move right slowly
            gosub 300   : rem pause briefly
            xvel=0      : rem stop motion
            gosub 300   : rem pause briefly
            xvel=200    : rem move right at full speed
            gosub 300   : rem pause briefly
            xvel=0      : rem stop
            gosub 300

            xvel=-50    : rem move left slowly
            gosub 300   : rem pause
            xvel=0      : rem stop
            gosub 300
            xvel=-200   : rem move left at maximum speed
            gosub 300
            xvel=0      : rem stop
            gosub 300
            goto 100    : rem repeat right, left action

        300 for i = 1 to 10 : rem delay for a while
            next
            return

