In which decade was the first electronic point-of-sale (POS) system commercially implemented in retail?

Modern retail relies on sophisticated point-of-sale (POS) systems for seamless transactions, inventory management, and customer data collection. But the evolution of these systems has a fascinating history spanning decades of retail innovation. This trivia question challenges you to identify when this retail revolution first began, fundamentally changing how businesses processed sales and tracked inventory.

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1950s, with NCR's electronic cash register at Macy's
1960s, with IBM's first retail transaction system for McDonald's
1970s, with IBM's store systems used by Pathmark supermarkets
1980s, with Fujitsu's integrated retail POS for Walmart