        REM MOVY
        REM This droid moves up slowly at first, stops,
        REM then moves quickly and stops.  It does the same
        REM when it moves down.

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

            yvel=-50    : rem move up slowly
            gosub 300   : rem pause
            yvel=0      : rem stop
            gosub 300
            yvel=-200   : rem move up at maximum speed
            gosub 300
            yvel=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

