[CrLf]

And Arkanoid had 486, which made me fear this project wouldn't have enough resolution for decent gameplay, yet it works perfectly (for my standards, at least).

I'm not sure why Arkanoid's spinner had so many steps. It can be to allow for pixel-by-pixel movement on its 336 pixel horizontal resolution, but it can also be because the way they were polling the encoder might miss some quadrature steps and they needed the extra resolution to ensure smooth control. Perhaps a combination of the two.