Can anyone decipher this?

Hi! Can anyone decipher the way my current system is setup?

Specifically, the nomenclature on the door panel.

 Panel is your concord 4 Panel (not shown)

SNAP card is an expansion board that pushes into the 14 pin connector on the Right side of the panel

No idea what HIM stands for, but those are 3 SuperBus 2000 8 Zone modules to accommodate additional wired zones.