The Youtube video for Perestroika is missing the sound from the intro because the game was skipping it if the CPU was too fast. I remember hearing it on a "Victor" 286 (16 MHz, but I am not sure). This recording has the sound intro: https://www.youtube.com/watch?v=_IpYuXJ6u6A. This was quite amazing to get something like that out of a PC speaker. I don't think other games of this era was able to do that.