Identifying zones in Vista 128FB

I have what looks like a Vista 128FB that I’m trying to transfer to a Ring retrofit unit.

1) Did I get the model right and am I looking at the right schematic?

2) Looking at this it seems like Zones 1-8 go in inputs 15-27, but all those seem empty. Could that be because the contact sensors are wireless, or is it possible they are wired elsewhere?

3) What’s that little sub-board on the bottom left?

Thank you!

submitted by /u/airatlantic
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