Just a small post to show you a video of one of the most famous, old-school demos : Second Reality, by Future Crew (1993).
Back then you had to tweak your autoexec.bat and config.sys to get enough memory to run those beautiful demos. If you didn’t have a Gravis Ultrasound you didn’t always get sound. You also didn’t have any 3D card so know that this is all software rendering.
Merry Christmas 😉