Which calculator brand was the first to introduce a point-of-sale specific model that became widely adopted by retail chains in the 1970s, revolutionizing checkout accuracy?

The development of calculators revolutionized mathematical education and retail operations alike. Before electronic point-of-sale systems became ubiquitous, calculators were essential tools for retail management, inventory tracking, and customer transactions. This poll explores the fascinating intersection of mathematics education and retail history through the lens of a groundbreaking calculator product that transformed both industries.

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Texas Instruments with their TI-5100 Retail Manager
Casio with their PCS-01 Point-of-Sale Calculator
Sharp with their ER-A101 Electronic Cash Register
Hewlett-Packard with their HP-97 Retail System