I am not actually sure what this is! It says "demo tape" but I don't believe it was shipped with any of the systems. The system tapes are black with black or blue and silver labels, but this is a white cassette with an orange-red label. My best guess is perhaps this was used by stores to display an endless loop demonstrating some of the X1 capabilities. I could imagine spending hours gazing at the various machines running their demos at a big Yodobashi Camera or the like. Anyway, here is some of the content.