We visited a small private collection of arcades from the Soviet era in Moscow. Given my field of work and the man years I spent playing video games, I found this interesting.
Lots of mechanical, as in little moving parts, displays. This, instead of the raster graphics on CRT displays common at the time. I will have to look more into what kind of processors these things used and how capable they were.
Add terrible video games to the list of why it was crappy to grow up in the USSR.