>>Several decades ago, I do remember seeing a joke program titled something like "Realistic Spaceflight Simulator". The introduction states how this program shows you a "realistic depiction" of actual spaceflight to nearby Alpha Centauri using currently-available technology -- in real time. When you press a key to begin the voyage, the screen changes to a starfield and a running time elapsed display. Being that the program was written in interpretive BASIC, you could easily look at the program code. Perhaps not surprising there isn't much to the program -- and is obvious that user was never meant to actually finish the game. I did find it amusing that examination of the loop code between "start" end "arrived" display, revealed that the loop would take on the order of several tens of thousands of years to complete.
>
>Should be updated for a 24 - 34 year time frame: https://en.wikipedia.org/wiki/Breakthrough_Starshot

This of course raises a question -- would there be a computer system that is capable to be running for the necessary amount of time (decades-long timespan) ?
https://www.computerworld.com/article/3162416/booted-up-in-1993-this-server-still-runs-but-not-for-much-longer.html
hrm... perhaps they do exist... I'm assuming that this computer system was running while being at least having some maintenance performed on it.

Always did find it amusing how TV and movie computers seem to have incredibly long lifespans -- often on the order of centuries or even millennia. But it only takes a bit of illogic or contradiction to cause them to fail spectacularly in a shower of sparks. Of course, if such computers had some form of AI, I'd imagine they could "go a bit peculiar" like Holly in "Red Dwarf" simply go mad like Box in "Logan's Run"