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The AS/400 is more recently branded as the IBM iSeries, and while it may have been from 1988, it has been and continues to be updated and maintained. Just as Costco's apps on the systems are surely updated and maintained.

So if we accept the premise that Costco runs on software from 1988, then we must also say that Linux-based systems run on software from 1991. Or shall we take this ill-advised path even further and say that Macs run on software from 1969?

At one point, Fry's electronics switched from a super old text-based PoS system to an at-the-time modern one, and the new one was significantly slower and less reliable.