From the website:
Retail Data Systems is the largest provider of Point Of Sale Hardware and Software, in North America. Founded in 1950, RDS now operates over 25 offices serving customers across the nation providing complete Point Of Sale technology. Our team of over 400 professionals assure our customers of the best 24 7 365 service available. Our list of industry leading POS hardware and software products provide a variety of solutions for companies large and small.