Warhead is a space combat sim created by Glyn Williams and published in 1990 by Activision for Amiga and Atari ST.
Just like Elite, you play the game from the cockpit of your ship, with a first-person perspective and 3D-filled vector graphics. But the game is mission-based, with a plot that connects them all. Warhead is probably the first space sim with this structure since Wing Commander was released after it.
One of the main characteristics of the game is realistic physics. For example, no gravity or friction is stopping your ship, so once you have impressed a speed, your vessel won't stop unless you use the engines to go in the reverse direction. This makes the controls more complicated compared to arcades games. Thank god you can use several pre-programmed autopilots to perform standard tasks.
The quality of the programming made by Glyn Williams is really amazing, Warhead is a fantastic game that was ahead of its time. If you like space combat sims, you have to try it.