My Sakura machine has a little ball pass-through opening with a sensor visible in it. I've tried dropping balls through the hole and watching them go through during play, but it doesn't seem to do anything.

Any idea what it's supposed to do, if anything?

Edit: Nevermind! It stores "tulip" openings. It also explained what the color-changing indicator in the lower right does. Now if I could only figure out what the letters mean.

Figuring out these machines is like trying to decipher heiroglyphics.