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Cash Register: Useless Error Message

This message may be useful, in the sense that it reports something about the internal state of the cash register:

Walmart cash register - buffer full message
Walmart cash register – buffer full message

But the fact that it appears on the customer-facing display means that the cashier won’t see it and can’t do anything about it. I’m not sure if the floor personnel know anything about buffers, either.

The cashier-facing display says: “Welcome to Walmart!”