This guy has posted the digitalized recordings (from cassette) that he and his friends made in the 80s at their visits to Video Arcades.
"Hear the classic arcade ambience like you haven't heard it in over a quarter of a century! The blend of several video games being played simultaneously, the kids yelling and the quarters clanking. We will never hear such beautiful chaos quite the same way again...."
http://www.coinopvideogames.com/sounds.php