From the second-ever demo of the game, which was leaked and uploaded online. Still is hard to find one that isn't pure scam, and it gets harder as the game dives deeper into forgotten lost media territory.

From the last demo, which is the multiplayer one. No more official video online, but several low quality videos since it was a stream. Harder to reconstruct.

More technical information available from a specifications dump forked from 'lucaspiller' on GitHub at the web address below: 

https://github.com/hydralisk98/dcpu-specs