Home Depot. Even ~15 years ago, they had an amazing amount of technology to support a single store, let alone the supply chain.

I once worked in Point of Sale (POS) at Darden and several POS vendors and consulting companies. Even 25 years ago, your average fast food or mid-range (e.g. Red Lobster) restaurant had a network of ~10 or more computers running various POS, inventory, ordering, scheduling, and other processes.