When I was 9 years old of ages, I got my first ever personal computer "National MSX CF-2000", then had much fun in coding RPG game programs. Besides, I got so excited to listen to the noisy sound recorded on the cassette tapes for storing the programs I had typed with keyboards. Oddly enough, on choosing a cassette tape of music to bring with me for vacation, I picked out the one full of the sound of those brutal noises, instead of the soundtrack of "Ghostbusters".