Which company introduced the first commercially successful electronic point-of-sale system with a graphical interface that revolutionized retail checkout in the 1970s?

Before computerized systems transformed retail forever, cash registers and manual methods dominated storefronts. The evolution of point-of-sale technology represents one of retail's most significant historical developments, dramatically changing how merchants track inventory, process transactions, and analyze sales data. This trivia question explores a pivotal moment in retail technology history that set the foundation for today's sophisticated POS systems.

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IBM (with the IBM 3660 Supermarket System)
NCR (with the NCR 280 Electronic Cash Register)
Casio (with the Casio EL-500 Electronic Register)
Digital Equipment Corporation (with the DEC POS-8 System)