Description from pouet.net and how it works (1)
The Mars demo was written by Elixir's resident graphics guru and Head of R & D Tim Clarke in 1993, whilst he was still at school. Freely distributed on the Internet, the demo soon gained legendary status for its ability to generate fractal terrain and render it real time, all with a meagre 5K. As a result Tim was headhunted to work for space agency Lunacorp in Washington for several summers whilst studying at Cambridge University.
We recommend running this in DOS mode as it was designed to run on a 386 and may well crash Windows. Remember that this demo was designed for machines that were around in 1993! Use the mouse to move around and press any key to quit.