Some of Japanese comics from the toys and online tend to use "キゴカゴ," (ki-go-ka-go or ki go ka go go and other variations thereof) depending on the length/pitch etc. Which originally I thought was pretty odd, but really it is fairly close and just as good as any other versions I have seen.
Even though the tech desciption say and 8hz sound. Surely they must have sampled it from somewhere. I am still none the wiser as to the origins. KNowing the 80's though, it's probably just taken from an electric keyboard and been fiddled with.