I am aware that the Prometheus was an important research ship whereas the Nostromo was just a mining ship, but that alone is not a satisfactory explanation for the sheer technological difference between these two ships.
The Nostromo used CRD screens and a really basic computer operating system.
The Prometheus, a much older ship, had freaking hologram computers.
One might argue that this is merely a matter of price, but consider this. Physical hardware is heavier and more bulky than holographic readouts, and both weight and space would be important on a mining ship (I know weight is meaningless in space, but the heavier a ship is, the more fuel it has to expend both entering and exiting a planet's gravity).
Furthermore, the Prometheus approximately 100 years older than the Nostromo. How could the owner of the Nostromo be unable to afford tech that is at least 100 years old? It would be like a miner in today's world being forced to use bronze tools and wooden logs for transport because he can't afford steel tools or the wheel.
Please bear in mind, I am not asking why the Nostromo looks so low tech. I am happy to believe that in the Alien universe that tech was appropriate. My question is "why is the Nostromo so low tech when there was far more advanced tech available over 100 years ago?"